1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * hosting IBM Z kernel virtual machines (s390x)
4 *
5 * Copyright IBM Corp. 2008, 2020
6 *
7 * Author(s): Carsten Otte <cotte@de.ibm.com>
8 * Christian Borntraeger <borntraeger@de.ibm.com>
9 * Christian Ehrhardt <ehrhardt@de.ibm.com>
10 * Jason J. Herne <jjherne@us.ibm.com>
11 */
12
13 #define pr_fmt(fmt) "kvm-s390: " fmt
14
15 #include <linux/compiler.h>
16 #include <linux/entry-virt.h>
17 #include <linux/export.h>
18 #include <linux/err.h>
19 #include <linux/fs.h>
20 #include <linux/hrtimer.h>
21 #include <linux/init.h>
22 #include <linux/kvm.h>
23 #include <linux/kvm_host.h>
24 #include <linux/mman.h>
25 #include <linux/module.h>
26 #include <linux/moduleparam.h>
27 #include <linux/cpufeature.h>
28 #include <linux/random.h>
29 #include <linux/slab.h>
30 #include <linux/timer.h>
31 #include <linux/vmalloc.h>
32 #include <linux/bitmap.h>
33 #include <linux/sched/signal.h>
34 #include <linux/string.h>
35 #include <linux/pgtable.h>
36 #include <linux/mmu_notifier.h>
37
38 #include <asm/access-regs.h>
39 #include <asm/asm-offsets.h>
40 #include <asm/lowcore.h>
41 #include <asm/machine.h>
42 #include <asm/stp.h>
43 #include <asm/gmap_helpers.h>
44 #include <asm/nmi.h>
45 #include <asm/isc.h>
46 #include <asm/sclp.h>
47 #include <asm/cpacf.h>
48 #include <asm/timex.h>
49 #include <asm/asm.h>
50 #include <asm/fpu.h>
51 #include <asm/ap.h>
52 #include <asm/uv.h>
53 #include "kvm-s390.h"
54 #include "gaccess.h"
55 #include "gmap.h"
56 #include "faultin.h"
57 #include "pci.h"
58
59 #define CREATE_TRACE_POINTS
60 #include "trace.h"
61 #include "trace-s390.h"
62
63 #define MEM_OP_MAX_SIZE 65536 /* Maximum transfer size for KVM_S390_MEM_OP */
64 #define LOCAL_IRQS 32
65 #define VCPU_IRQS_MAX_BUF (sizeof(struct kvm_s390_irq) * \
66 (KVM_MAX_VCPUS + LOCAL_IRQS))
67
68 const struct kvm_stats_desc kvm_vm_stats_desc[] = {
69 KVM_GENERIC_VM_STATS(),
70 STATS_DESC_COUNTER(VM, inject_io),
71 STATS_DESC_COUNTER(VM, inject_float_mchk),
72 STATS_DESC_COUNTER(VM, inject_pfault_done),
73 STATS_DESC_COUNTER(VM, inject_service_signal),
74 STATS_DESC_COUNTER(VM, inject_virtio),
75 STATS_DESC_COUNTER(VM, aen_forward),
76 STATS_DESC_COUNTER(VM, gmap_shadow_reuse),
77 STATS_DESC_COUNTER(VM, gmap_shadow_create),
78 STATS_DESC_COUNTER(VM, gmap_shadow_r1_entry),
79 STATS_DESC_COUNTER(VM, gmap_shadow_r2_entry),
80 STATS_DESC_COUNTER(VM, gmap_shadow_r3_entry),
81 STATS_DESC_COUNTER(VM, gmap_shadow_sg_entry),
82 STATS_DESC_COUNTER(VM, gmap_shadow_pg_entry),
83 };
84
85 const struct kvm_stats_header kvm_vm_stats_header = {
86 .name_size = KVM_STATS_NAME_SIZE,
87 .num_desc = ARRAY_SIZE(kvm_vm_stats_desc),
88 .id_offset = sizeof(struct kvm_stats_header),
89 .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
90 .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
91 sizeof(kvm_vm_stats_desc),
92 };
93
94 const struct kvm_stats_desc kvm_vcpu_stats_desc[] = {
95 KVM_GENERIC_VCPU_STATS(),
96 STATS_DESC_COUNTER(VCPU, exit_userspace),
97 STATS_DESC_COUNTER(VCPU, exit_null),
98 STATS_DESC_COUNTER(VCPU, exit_external_request),
99 STATS_DESC_COUNTER(VCPU, exit_io_request),
100 STATS_DESC_COUNTER(VCPU, exit_external_interrupt),
101 STATS_DESC_COUNTER(VCPU, exit_stop_request),
102 STATS_DESC_COUNTER(VCPU, exit_validity),
103 STATS_DESC_COUNTER(VCPU, exit_instruction),
104 STATS_DESC_COUNTER(VCPU, exit_pei),
105 STATS_DESC_COUNTER(VCPU, halt_no_poll_steal),
106 STATS_DESC_COUNTER(VCPU, instruction_lctl),
107 STATS_DESC_COUNTER(VCPU, instruction_lctlg),
108 STATS_DESC_COUNTER(VCPU, instruction_stctl),
109 STATS_DESC_COUNTER(VCPU, instruction_stctg),
110 STATS_DESC_COUNTER(VCPU, exit_program_interruption),
111 STATS_DESC_COUNTER(VCPU, exit_instr_and_program),
112 STATS_DESC_COUNTER(VCPU, exit_operation_exception),
113 STATS_DESC_COUNTER(VCPU, deliver_ckc),
114 STATS_DESC_COUNTER(VCPU, deliver_cputm),
115 STATS_DESC_COUNTER(VCPU, deliver_external_call),
116 STATS_DESC_COUNTER(VCPU, deliver_emergency_signal),
117 STATS_DESC_COUNTER(VCPU, deliver_service_signal),
118 STATS_DESC_COUNTER(VCPU, deliver_virtio),
119 STATS_DESC_COUNTER(VCPU, deliver_stop_signal),
120 STATS_DESC_COUNTER(VCPU, deliver_prefix_signal),
121 STATS_DESC_COUNTER(VCPU, deliver_restart_signal),
122 STATS_DESC_COUNTER(VCPU, deliver_program),
123 STATS_DESC_COUNTER(VCPU, deliver_io),
124 STATS_DESC_COUNTER(VCPU, deliver_machine_check),
125 STATS_DESC_COUNTER(VCPU, exit_wait_state),
126 STATS_DESC_COUNTER(VCPU, inject_ckc),
127 STATS_DESC_COUNTER(VCPU, inject_cputm),
128 STATS_DESC_COUNTER(VCPU, inject_external_call),
129 STATS_DESC_COUNTER(VCPU, inject_emergency_signal),
130 STATS_DESC_COUNTER(VCPU, inject_mchk),
131 STATS_DESC_COUNTER(VCPU, inject_pfault_init),
132 STATS_DESC_COUNTER(VCPU, inject_program),
133 STATS_DESC_COUNTER(VCPU, inject_restart),
134 STATS_DESC_COUNTER(VCPU, inject_set_prefix),
135 STATS_DESC_COUNTER(VCPU, inject_stop_signal),
136 STATS_DESC_COUNTER(VCPU, instruction_epsw),
137 STATS_DESC_COUNTER(VCPU, instruction_gs),
138 STATS_DESC_COUNTER(VCPU, instruction_io_other),
139 STATS_DESC_COUNTER(VCPU, instruction_lpsw),
140 STATS_DESC_COUNTER(VCPU, instruction_lpswe),
141 STATS_DESC_COUNTER(VCPU, instruction_lpswey),
142 STATS_DESC_COUNTER(VCPU, instruction_pfmf),
143 STATS_DESC_COUNTER(VCPU, instruction_ptff),
144 STATS_DESC_COUNTER(VCPU, instruction_sck),
145 STATS_DESC_COUNTER(VCPU, instruction_sckpf),
146 STATS_DESC_COUNTER(VCPU, instruction_stidp),
147 STATS_DESC_COUNTER(VCPU, instruction_spx),
148 STATS_DESC_COUNTER(VCPU, instruction_stpx),
149 STATS_DESC_COUNTER(VCPU, instruction_stap),
150 STATS_DESC_COUNTER(VCPU, instruction_iske),
151 STATS_DESC_COUNTER(VCPU, instruction_ri),
152 STATS_DESC_COUNTER(VCPU, instruction_rrbe),
153 STATS_DESC_COUNTER(VCPU, instruction_sske),
154 STATS_DESC_COUNTER(VCPU, instruction_ipte_interlock),
155 STATS_DESC_COUNTER(VCPU, instruction_stsi),
156 STATS_DESC_COUNTER(VCPU, instruction_stfl),
157 STATS_DESC_COUNTER(VCPU, instruction_tb),
158 STATS_DESC_COUNTER(VCPU, instruction_tpi),
159 STATS_DESC_COUNTER(VCPU, instruction_tprot),
160 STATS_DESC_COUNTER(VCPU, instruction_tsch),
161 STATS_DESC_COUNTER(VCPU, instruction_sie),
162 STATS_DESC_COUNTER(VCPU, instruction_essa),
163 STATS_DESC_COUNTER(VCPU, instruction_sthyi),
164 STATS_DESC_COUNTER(VCPU, instruction_sigp_sense),
165 STATS_DESC_COUNTER(VCPU, instruction_sigp_sense_running),
166 STATS_DESC_COUNTER(VCPU, instruction_sigp_external_call),
167 STATS_DESC_COUNTER(VCPU, instruction_sigp_emergency),
168 STATS_DESC_COUNTER(VCPU, instruction_sigp_cond_emergency),
169 STATS_DESC_COUNTER(VCPU, instruction_sigp_start),
170 STATS_DESC_COUNTER(VCPU, instruction_sigp_stop),
171 STATS_DESC_COUNTER(VCPU, instruction_sigp_stop_store_status),
172 STATS_DESC_COUNTER(VCPU, instruction_sigp_store_status),
173 STATS_DESC_COUNTER(VCPU, instruction_sigp_store_adtl_status),
174 STATS_DESC_COUNTER(VCPU, instruction_sigp_arch),
175 STATS_DESC_COUNTER(VCPU, instruction_sigp_prefix),
176 STATS_DESC_COUNTER(VCPU, instruction_sigp_restart),
177 STATS_DESC_COUNTER(VCPU, instruction_sigp_init_cpu_reset),
178 STATS_DESC_COUNTER(VCPU, instruction_sigp_cpu_reset),
179 STATS_DESC_COUNTER(VCPU, instruction_sigp_unknown),
180 STATS_DESC_COUNTER(VCPU, instruction_diagnose_10),
181 STATS_DESC_COUNTER(VCPU, instruction_diagnose_44),
182 STATS_DESC_COUNTER(VCPU, instruction_diagnose_9c),
183 STATS_DESC_COUNTER(VCPU, diag_9c_ignored),
184 STATS_DESC_COUNTER(VCPU, diag_9c_forward),
185 STATS_DESC_COUNTER(VCPU, instruction_diagnose_258),
186 STATS_DESC_COUNTER(VCPU, instruction_diagnose_308),
187 STATS_DESC_COUNTER(VCPU, instruction_diagnose_500),
188 STATS_DESC_COUNTER(VCPU, instruction_diagnose_other),
189 STATS_DESC_COUNTER(VCPU, pfault_sync),
190 STATS_DESC_COUNTER(VCPU, signal_exits)
191 };
192
193 const struct kvm_stats_header kvm_vcpu_stats_header = {
194 .name_size = KVM_STATS_NAME_SIZE,
195 .num_desc = ARRAY_SIZE(kvm_vcpu_stats_desc),
196 .id_offset = sizeof(struct kvm_stats_header),
197 .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
198 .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
199 sizeof(kvm_vcpu_stats_desc),
200 };
201
202 /* allow nested virtualization in KVM (if enabled by user space) */
203 static int nested;
204 module_param(nested, int, S_IRUGO);
205 MODULE_PARM_DESC(nested, "Nested virtualization support");
206
207 /* allow 1m huge page guest backing, if !nested */
208 static int hpage;
209 module_param(hpage, int, 0444);
210 MODULE_PARM_DESC(hpage, "1m huge page backing support");
211
212 /* maximum percentage of steal time for polling. >100 is treated like 100 */
213 static u8 halt_poll_max_steal = 10;
214 module_param(halt_poll_max_steal, byte, 0644);
215 MODULE_PARM_DESC(halt_poll_max_steal, "Maximum percentage of steal time to allow polling");
216
217 /* if set to true, the GISA will be initialized and used if available */
218 static bool use_gisa = true;
219 module_param(use_gisa, bool, 0644);
220 MODULE_PARM_DESC(use_gisa, "Use the GISA if the host supports it.");
221
222 /* maximum diag9c forwarding per second */
223 unsigned int diag9c_forwarding_hz;
224 module_param(diag9c_forwarding_hz, uint, 0644);
225 MODULE_PARM_DESC(diag9c_forwarding_hz, "Maximum diag9c forwarding per second, 0 to turn off");
226
227 /*
228 * allow asynchronous deinit for protected guests; enable by default since
229 * the feature is opt-in anyway
230 */
231 static int async_destroy = 1;
232 module_param(async_destroy, int, 0444);
233 MODULE_PARM_DESC(async_destroy, "Asynchronous destroy for protected guests");
234
235 /*
236 * For now we handle at most 16 double words as this is what the s390 base
237 * kernel handles and stores in the prefix page. If we ever need to go beyond
238 * this, this requires changes to code, but the external uapi can stay.
239 */
240 #define SIZE_INTERNAL 16
241
242 /*
243 * Base feature mask that defines default mask for facilities. Consists of the
244 * defines in FACILITIES_KVM and the non-hypervisor managed bits.
245 */
246 static unsigned long kvm_s390_fac_base[SIZE_INTERNAL] = { FACILITIES_KVM };
247 /*
248 * Extended feature mask. Consists of the defines in FACILITIES_KVM_CPUMODEL
249 * and defines the facilities that can be enabled via a cpu model.
250 */
251 static unsigned long kvm_s390_fac_ext[SIZE_INTERNAL] = { FACILITIES_KVM_CPUMODEL };
252
kvm_s390_fac_size(void)253 static unsigned long kvm_s390_fac_size(void)
254 {
255 BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_MASK_SIZE_U64);
256 BUILD_BUG_ON(SIZE_INTERNAL > S390_ARCH_FAC_LIST_SIZE_U64);
257 BUILD_BUG_ON(SIZE_INTERNAL * sizeof(unsigned long) >
258 sizeof(stfle_fac_list));
259
260 return SIZE_INTERNAL;
261 }
262
263 /* available cpu features supported by kvm */
264 static DECLARE_BITMAP(kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
265 /* available subfunctions indicated via query / "test bit" */
266 static struct kvm_s390_vm_cpu_subfunc kvm_s390_available_subfunc;
267
268 debug_info_t *kvm_s390_dbf;
269 debug_info_t *kvm_s390_dbf_uv;
270
271 /* Section: not file related */
272 /* forward declarations */
kvm_clock_sync_scb(struct kvm_s390_sie_block * scb,u64 delta)273 static void kvm_clock_sync_scb(struct kvm_s390_sie_block *scb, u64 delta)
274 {
275 u8 delta_idx = 0;
276
277 /*
278 * The TOD jumps by delta, we have to compensate this by adding
279 * -delta to the epoch.
280 */
281 delta = -delta;
282
283 /* sign-extension - we're adding to signed values below */
284 if ((s64)delta < 0)
285 delta_idx = -1;
286
287 scb->epoch += delta;
288 if (scb->ecd & ECD_MEF) {
289 scb->epdx += delta_idx;
290 if (scb->epoch < delta)
291 scb->epdx += 1;
292 }
293 }
294
295 /*
296 * This callback is executed during stop_machine(). All CPUs are therefore
297 * temporarily stopped. In order not to change guest behavior, we have to
298 * disable preemption whenever we touch the epoch of kvm and the VCPUs,
299 * so a CPU won't be stopped while calculating with the epoch.
300 */
kvm_clock_sync(struct notifier_block * notifier,unsigned long val,void * v)301 static int kvm_clock_sync(struct notifier_block *notifier, unsigned long val,
302 void *v)
303 {
304 struct kvm *kvm;
305 struct kvm_vcpu *vcpu;
306 unsigned long i;
307 unsigned long long *delta = v;
308
309 list_for_each_entry(kvm, &vm_list, vm_list) {
310 kvm_for_each_vcpu(i, vcpu, kvm) {
311 kvm_clock_sync_scb(vcpu->arch.sie_block, *delta);
312 if (i == 0) {
313 kvm->arch.epoch = vcpu->arch.sie_block->epoch;
314 kvm->arch.epdx = vcpu->arch.sie_block->epdx;
315 }
316 if (vcpu->arch.cputm_enabled)
317 vcpu->arch.cputm_start += *delta;
318 if (vcpu->arch.vsie_block)
319 kvm_clock_sync_scb(vcpu->arch.vsie_block,
320 *delta);
321 }
322 }
323 return NOTIFY_OK;
324 }
325
326 static struct notifier_block kvm_clock_notifier = {
327 .notifier_call = kvm_clock_sync,
328 };
329
allow_cpu_feat(unsigned long nr)330 static void allow_cpu_feat(unsigned long nr)
331 {
332 set_bit_inv(nr, kvm_s390_available_cpu_feat);
333 }
334
plo_test_bit(unsigned char nr)335 static inline int plo_test_bit(unsigned char nr)
336 {
337 unsigned long function = (unsigned long)nr | 0x100;
338 int cc;
339
340 asm volatile(
341 " lgr 0,%[function]\n"
342 /* Parameter registers are ignored for "test bit" */
343 " plo 0,0,0,0(0)\n"
344 CC_IPM(cc)
345 : CC_OUT(cc, cc)
346 : [function] "d" (function)
347 : CC_CLOBBER_LIST("0"));
348 return CC_TRANSFORM(cc) == 0;
349 }
350
pfcr_query(u8 (* query)[16])351 static __always_inline void pfcr_query(u8 (*query)[16])
352 {
353 asm volatile(
354 " lghi 0,0\n"
355 " .insn rsy,0xeb0000000016,0,0,%[query]"
356 : [query] "=QS" (*query)
357 :
358 : "cc", "0");
359 }
360
__sortl_query(u8 (* query)[32])361 static __always_inline void __sortl_query(u8 (*query)[32])
362 {
363 asm volatile(
364 " lghi 0,0\n"
365 " la 1,%[query]\n"
366 /* Parameter registers are ignored */
367 " .insn rre,0xb9380000,2,4"
368 : [query] "=R" (*query)
369 :
370 : "cc", "0", "1");
371 }
372
__dfltcc_query(u8 (* query)[32])373 static __always_inline void __dfltcc_query(u8 (*query)[32])
374 {
375 asm volatile(
376 " lghi 0,0\n"
377 " la 1,%[query]\n"
378 /* Parameter registers are ignored */
379 " .insn rrf,0xb9390000,2,4,6,0"
380 : [query] "=R" (*query)
381 :
382 : "cc", "0", "1");
383 }
384
kvm_s390_cpu_feat_init(void)385 static void __init kvm_s390_cpu_feat_init(void)
386 {
387 int i;
388
389 for (i = 0; i < 256; ++i) {
390 if (plo_test_bit(i))
391 kvm_s390_available_subfunc.plo[i >> 3] |= 0x80 >> (i & 7);
392 }
393
394 if (test_facility(28)) /* TOD-clock steering */
395 ptff(kvm_s390_available_subfunc.ptff,
396 sizeof(kvm_s390_available_subfunc.ptff),
397 PTFF_QAF);
398
399 if (test_facility(17)) { /* MSA */
400 __cpacf_query(CPACF_KMAC, (cpacf_mask_t *)
401 kvm_s390_available_subfunc.kmac);
402 __cpacf_query(CPACF_KMC, (cpacf_mask_t *)
403 kvm_s390_available_subfunc.kmc);
404 __cpacf_query(CPACF_KM, (cpacf_mask_t *)
405 kvm_s390_available_subfunc.km);
406 __cpacf_query(CPACF_KIMD, (cpacf_mask_t *)
407 kvm_s390_available_subfunc.kimd);
408 __cpacf_query(CPACF_KLMD, (cpacf_mask_t *)
409 kvm_s390_available_subfunc.klmd);
410 }
411 if (test_facility(76)) /* MSA3 */
412 __cpacf_query(CPACF_PCKMO, (cpacf_mask_t *)
413 kvm_s390_available_subfunc.pckmo);
414 if (test_facility(77)) { /* MSA4 */
415 __cpacf_query(CPACF_KMCTR, (cpacf_mask_t *)
416 kvm_s390_available_subfunc.kmctr);
417 __cpacf_query(CPACF_KMF, (cpacf_mask_t *)
418 kvm_s390_available_subfunc.kmf);
419 __cpacf_query(CPACF_KMO, (cpacf_mask_t *)
420 kvm_s390_available_subfunc.kmo);
421 __cpacf_query(CPACF_PCC, (cpacf_mask_t *)
422 kvm_s390_available_subfunc.pcc);
423 }
424 if (test_facility(57)) /* MSA5 */
425 __cpacf_query(CPACF_PRNO, (cpacf_mask_t *)
426 kvm_s390_available_subfunc.ppno);
427
428 if (test_facility(146)) /* MSA8 */
429 __cpacf_query(CPACF_KMA, (cpacf_mask_t *)
430 kvm_s390_available_subfunc.kma);
431
432 if (test_facility(155)) /* MSA9 */
433 __cpacf_query(CPACF_KDSA, (cpacf_mask_t *)
434 kvm_s390_available_subfunc.kdsa);
435
436 if (test_facility(150)) /* SORTL */
437 __sortl_query(&kvm_s390_available_subfunc.sortl);
438
439 if (test_facility(151)) /* DFLTCC */
440 __dfltcc_query(&kvm_s390_available_subfunc.dfltcc);
441
442 if (test_facility(201)) /* PFCR */
443 pfcr_query(&kvm_s390_available_subfunc.pfcr);
444
445 if (machine_has_esop())
446 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_ESOP);
447 /*
448 * We need SIE support, ESOP (PROT_READ protection for gmap_shadow),
449 * 64bit SCAO (SCA passthrough) and IDTE (for gmap_shadow unshadowing).
450 */
451 if (!sclp.has_sief2 || !machine_has_esop() || !sclp.has_64bscao ||
452 !test_facility(3) || !nested)
453 return;
454 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIEF2);
455 if (sclp.has_64bscao)
456 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_64BSCAO);
457 if (sclp.has_siif)
458 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_SIIF);
459 if (sclp.has_gpere)
460 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GPERE);
461 if (sclp.has_gsls)
462 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_GSLS);
463 if (sclp.has_ib)
464 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IB);
465 if (sclp.has_cei)
466 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_CEI);
467 if (sclp.has_ibs)
468 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_IBS);
469 if (sclp.has_kss)
470 allow_cpu_feat(KVM_S390_VM_CPU_FEAT_KSS);
471 /*
472 * KVM_S390_VM_CPU_FEAT_SKEY: Wrong shadow of PTE.I bits will make
473 * all skey handling functions read/set the skey from the PGSTE
474 * instead of the real storage key.
475 *
476 * KVM_S390_VM_CPU_FEAT_CMMA: Wrong shadow of PTE.I bits will make
477 * pages being detected as preserved although they are resident.
478 *
479 * KVM_S390_VM_CPU_FEAT_PFMFI: Wrong shadow of PTE.I bits will
480 * have the same effect as for KVM_S390_VM_CPU_FEAT_SKEY.
481 *
482 * For KVM_S390_VM_CPU_FEAT_SKEY, KVM_S390_VM_CPU_FEAT_CMMA and
483 * KVM_S390_VM_CPU_FEAT_PFMFI, all PTE.I and PGSTE bits have to be
484 * correctly shadowed. We can do that for the PGSTE but not for PTE.I.
485 *
486 * KVM_S390_VM_CPU_FEAT_SIGPIF: Wrong SCB addresses in the SCA. We
487 * cannot easily shadow the SCA because of the ipte lock.
488 */
489 }
490
__kvm_s390_init(void)491 static int __init __kvm_s390_init(void)
492 {
493 int rc = -ENOMEM;
494
495 kvm_s390_dbf = debug_register("kvm-trace", 32, 1, 7 * sizeof(long));
496 if (!kvm_s390_dbf)
497 return -ENOMEM;
498
499 kvm_s390_dbf_uv = debug_register("kvm-uv", 32, 1, 7 * sizeof(long));
500 if (!kvm_s390_dbf_uv)
501 goto err_kvm_uv;
502
503 if (debug_register_view(kvm_s390_dbf, &debug_sprintf_view) ||
504 debug_register_view(kvm_s390_dbf_uv, &debug_sprintf_view))
505 goto err_debug_view;
506
507 kvm_s390_cpu_feat_init();
508
509 /* Register floating interrupt controller interface. */
510 rc = kvm_register_device_ops(&kvm_flic_ops, KVM_DEV_TYPE_FLIC);
511 if (rc) {
512 pr_err("A FLIC registration call failed with rc=%d\n", rc);
513 goto err_flic;
514 }
515
516 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) {
517 rc = kvm_s390_pci_init();
518 if (rc) {
519 pr_err("Unable to allocate AIFT for PCI\n");
520 goto err_pci;
521 }
522 }
523
524 rc = kvm_s390_gib_init(GAL_ISC);
525 if (rc)
526 goto err_gib;
527
528 atomic_notifier_chain_register(&s390_epoch_delta_notifier,
529 &kvm_clock_notifier);
530
531 return 0;
532
533 err_gib:
534 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))
535 kvm_s390_pci_exit();
536 err_pci:
537 err_flic:
538 err_debug_view:
539 debug_unregister(kvm_s390_dbf_uv);
540 err_kvm_uv:
541 debug_unregister(kvm_s390_dbf);
542 return rc;
543 }
544
__kvm_s390_exit(void)545 static void __kvm_s390_exit(void)
546 {
547 atomic_notifier_chain_unregister(&s390_epoch_delta_notifier,
548 &kvm_clock_notifier);
549
550 kvm_s390_gib_destroy();
551 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))
552 kvm_s390_pci_exit();
553 debug_unregister(kvm_s390_dbf);
554 debug_unregister(kvm_s390_dbf_uv);
555 }
556
kvm_s390_keyop(struct kvm_s390_mmu_cache * mc,struct kvm * kvm,int op,unsigned long addr,union skey skey)557 static int kvm_s390_keyop(struct kvm_s390_mmu_cache *mc, struct kvm *kvm, int op,
558 unsigned long addr, union skey skey)
559 {
560 union asce asce = kvm->arch.gmap->asce;
561 gfn_t gfn = gpa_to_gfn(addr);
562 int r;
563
564 guard(read_lock)(&kvm->mmu_lock);
565
566 switch (op) {
567 case KVM_S390_KEYOP_SSKE:
568 r = dat_cond_set_storage_key(mc, asce, gfn, skey, &skey, 0, 0, 0);
569 if (r >= 0)
570 return skey.skey;
571 break;
572 case KVM_S390_KEYOP_ISKE:
573 r = dat_get_storage_key(asce, gfn, &skey);
574 if (!r)
575 return skey.skey;
576 break;
577 case KVM_S390_KEYOP_RRBE:
578 r = dat_reset_reference_bit(asce, gfn);
579 if (r > 0)
580 return r << 1;
581 break;
582 default:
583 return -EINVAL;
584 }
585 return r;
586 }
587
588 /* Section: device related */
kvm_arch_dev_ioctl(struct file * filp,unsigned int ioctl,unsigned long arg)589 long kvm_arch_dev_ioctl(struct file *filp,
590 unsigned int ioctl, unsigned long arg)
591 {
592 if (ioctl == KVM_S390_ENABLE_SIE)
593 return 0;
594 return -EINVAL;
595 }
596
kvm_vm_ioctl_check_extension(struct kvm * kvm,long ext)597 int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
598 {
599 int r;
600
601 switch (ext) {
602 case KVM_CAP_S390_PSW:
603 case KVM_CAP_S390_GMAP:
604 #ifdef CONFIG_KVM_S390_UCONTROL
605 case KVM_CAP_S390_UCONTROL:
606 #endif
607 case KVM_CAP_ASYNC_PF:
608 case KVM_CAP_SYNC_REGS:
609 case KVM_CAP_ONE_REG:
610 case KVM_CAP_ENABLE_CAP:
611 case KVM_CAP_S390_CSS_SUPPORT:
612 case KVM_CAP_IOEVENTFD:
613 case KVM_CAP_S390_IRQCHIP:
614 case KVM_CAP_VM_ATTRIBUTES:
615 case KVM_CAP_MP_STATE:
616 case KVM_CAP_IMMEDIATE_EXIT:
617 case KVM_CAP_S390_INJECT_IRQ:
618 case KVM_CAP_S390_USER_SIGP:
619 case KVM_CAP_S390_USER_STSI:
620 case KVM_CAP_S390_SKEYS:
621 case KVM_CAP_S390_IRQ_STATE:
622 case KVM_CAP_S390_USER_INSTR0:
623 case KVM_CAP_S390_CMMA_MIGRATION:
624 case KVM_CAP_S390_AIS:
625 case KVM_CAP_S390_AIS_MIGRATION:
626 case KVM_CAP_S390_VCPU_RESETS:
627 case KVM_CAP_SET_GUEST_DEBUG:
628 case KVM_CAP_S390_DIAG318:
629 case KVM_CAP_IRQFD_RESAMPLE:
630 case KVM_CAP_S390_USER_OPEREXEC:
631 case KVM_CAP_S390_KEYOP:
632 case KVM_CAP_S390_VSIE_ESAMODE:
633 r = 1;
634 break;
635 case KVM_CAP_SET_GUEST_DEBUG2:
636 r = KVM_GUESTDBG_VALID_MASK;
637 break;
638 case KVM_CAP_S390_HPAGE_1M:
639 r = 0;
640 if (hpage && !(kvm && kvm_is_ucontrol(kvm)))
641 r = 1;
642 break;
643 case KVM_CAP_S390_MEM_OP:
644 r = MEM_OP_MAX_SIZE;
645 break;
646 case KVM_CAP_S390_MEM_OP_EXTENSION:
647 /*
648 * Flag bits indicating which extensions are supported.
649 * If r > 0, the base extension must also be supported/indicated,
650 * in order to maintain backwards compatibility.
651 */
652 r = KVM_S390_MEMOP_EXTENSION_CAP_BASE |
653 KVM_S390_MEMOP_EXTENSION_CAP_CMPXCHG;
654 break;
655 case KVM_CAP_NR_VCPUS:
656 case KVM_CAP_MAX_VCPUS:
657 case KVM_CAP_MAX_VCPU_ID:
658 /*
659 * Return the same value for KVM_CAP_MAX_VCPUS and
660 * KVM_CAP_MAX_VCPU_ID to conform with the KVM API.
661 */
662 r = KVM_S390_ESCA_CPU_SLOTS;
663 if (!kvm_s390_use_sca_entries())
664 r = KVM_MAX_VCPUS;
665 if (ext == KVM_CAP_NR_VCPUS)
666 r = min_t(unsigned int, num_online_cpus(), r);
667 break;
668 case KVM_CAP_S390_COW:
669 r = machine_has_esop();
670 break;
671 case KVM_CAP_S390_VECTOR_REGISTERS:
672 r = test_facility(129);
673 break;
674 case KVM_CAP_S390_RI:
675 r = test_facility(64);
676 break;
677 case KVM_CAP_S390_GS:
678 r = test_facility(133);
679 break;
680 case KVM_CAP_S390_BPB:
681 r = test_facility(82);
682 break;
683 case KVM_CAP_S390_PROTECTED_ASYNC_DISABLE:
684 r = async_destroy && is_prot_virt_host();
685 break;
686 case KVM_CAP_S390_PROTECTED:
687 r = is_prot_virt_host();
688 break;
689 case KVM_CAP_S390_PROTECTED_DUMP: {
690 u64 pv_cmds_dump[] = {
691 BIT_UVC_CMD_DUMP_INIT,
692 BIT_UVC_CMD_DUMP_CONFIG_STOR_STATE,
693 BIT_UVC_CMD_DUMP_CPU,
694 BIT_UVC_CMD_DUMP_COMPLETE,
695 };
696 int i;
697
698 r = is_prot_virt_host();
699
700 for (i = 0; i < ARRAY_SIZE(pv_cmds_dump); i++) {
701 if (!test_bit_inv(pv_cmds_dump[i],
702 (unsigned long *)&uv_info.inst_calls_list)) {
703 r = 0;
704 break;
705 }
706 }
707 break;
708 }
709 case KVM_CAP_S390_ZPCI_OP:
710 r = kvm_s390_pci_interp_allowed();
711 break;
712 case KVM_CAP_S390_CPU_TOPOLOGY:
713 r = test_facility(11);
714 break;
715 default:
716 r = 0;
717 }
718 return r;
719 }
720
kvm_arch_sync_dirty_log(struct kvm * kvm,struct kvm_memory_slot * memslot)721 void kvm_arch_sync_dirty_log(struct kvm *kvm, struct kvm_memory_slot *memslot)
722 {
723 gfn_t last_gfn = memslot->base_gfn + memslot->npages;
724
725 scoped_guard(read_lock, &kvm->mmu_lock)
726 gmap_sync_dirty_log(kvm->arch.gmap, memslot->base_gfn, last_gfn);
727 }
728
729 /* Section: vm related */
730 static void sca_del_vcpu(struct kvm_vcpu *vcpu);
731
732 /*
733 * Get (and clear) the dirty memory log for a memory slot.
734 */
kvm_vm_ioctl_get_dirty_log(struct kvm * kvm,struct kvm_dirty_log * log)735 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
736 struct kvm_dirty_log *log)
737 {
738 int r;
739 unsigned long n;
740 struct kvm_memory_slot *memslot;
741 int is_dirty;
742
743 if (kvm_is_ucontrol(kvm))
744 return -EINVAL;
745
746 mutex_lock(&kvm->slots_lock);
747
748 r = -EINVAL;
749 if (log->slot >= KVM_USER_MEM_SLOTS)
750 goto out;
751
752 r = kvm_get_dirty_log(kvm, log, &is_dirty, &memslot);
753 if (r)
754 goto out;
755
756 /* Clear the dirty log */
757 if (is_dirty) {
758 n = kvm_dirty_bitmap_bytes(memslot);
759 memset(memslot->dirty_bitmap, 0, n);
760 }
761 r = 0;
762 out:
763 mutex_unlock(&kvm->slots_lock);
764 return r;
765 }
766
icpt_operexc_on_all_vcpus(struct kvm * kvm)767 static void icpt_operexc_on_all_vcpus(struct kvm *kvm)
768 {
769 unsigned long i;
770 struct kvm_vcpu *vcpu;
771
772 kvm_for_each_vcpu(i, vcpu, kvm) {
773 kvm_s390_sync_request(KVM_REQ_ICPT_OPEREXC, vcpu);
774 }
775 }
776
kvm_vm_ioctl_enable_cap(struct kvm * kvm,struct kvm_enable_cap * cap)777 int kvm_vm_ioctl_enable_cap(struct kvm *kvm, struct kvm_enable_cap *cap)
778 {
779 int r;
780
781 if (cap->flags)
782 return -EINVAL;
783
784 switch (cap->cap) {
785 case KVM_CAP_S390_IRQCHIP:
786 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_IRQCHIP");
787 kvm->arch.use_irqchip = 1;
788 r = 0;
789 break;
790 case KVM_CAP_S390_USER_SIGP:
791 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_SIGP");
792 kvm->arch.user_sigp = 1;
793 r = 0;
794 break;
795 case KVM_CAP_S390_VECTOR_REGISTERS:
796 mutex_lock(&kvm->lock);
797 if (kvm->created_vcpus) {
798 r = -EBUSY;
799 } else if (cpu_has_vx()) {
800 set_kvm_facility(kvm->arch.model.fac_mask, 129);
801 set_kvm_facility(kvm->arch.model.fac_list, 129);
802 if (test_facility(134)) {
803 set_kvm_facility(kvm->arch.model.fac_mask, 134);
804 set_kvm_facility(kvm->arch.model.fac_list, 134);
805 }
806 if (test_facility(135)) {
807 set_kvm_facility(kvm->arch.model.fac_mask, 135);
808 set_kvm_facility(kvm->arch.model.fac_list, 135);
809 }
810 if (test_facility(148)) {
811 set_kvm_facility(kvm->arch.model.fac_mask, 148);
812 set_kvm_facility(kvm->arch.model.fac_list, 148);
813 }
814 if (test_facility(152)) {
815 set_kvm_facility(kvm->arch.model.fac_mask, 152);
816 set_kvm_facility(kvm->arch.model.fac_list, 152);
817 }
818 if (test_facility(192)) {
819 set_kvm_facility(kvm->arch.model.fac_mask, 192);
820 set_kvm_facility(kvm->arch.model.fac_list, 192);
821 }
822 if (test_facility(198)) {
823 set_kvm_facility(kvm->arch.model.fac_mask, 198);
824 set_kvm_facility(kvm->arch.model.fac_list, 198);
825 }
826 if (test_facility(199)) {
827 set_kvm_facility(kvm->arch.model.fac_mask, 199);
828 set_kvm_facility(kvm->arch.model.fac_list, 199);
829 }
830 r = 0;
831 } else
832 r = -EINVAL;
833 mutex_unlock(&kvm->lock);
834 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_VECTOR_REGISTERS %s",
835 r ? "(not available)" : "(success)");
836 break;
837 case KVM_CAP_S390_RI:
838 r = -EINVAL;
839 mutex_lock(&kvm->lock);
840 if (kvm->created_vcpus) {
841 r = -EBUSY;
842 } else if (test_facility(64)) {
843 set_kvm_facility(kvm->arch.model.fac_mask, 64);
844 set_kvm_facility(kvm->arch.model.fac_list, 64);
845 r = 0;
846 }
847 mutex_unlock(&kvm->lock);
848 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_RI %s",
849 r ? "(not available)" : "(success)");
850 break;
851 case KVM_CAP_S390_AIS:
852 mutex_lock(&kvm->lock);
853 if (kvm->created_vcpus) {
854 r = -EBUSY;
855 } else {
856 set_kvm_facility(kvm->arch.model.fac_mask, 72);
857 set_kvm_facility(kvm->arch.model.fac_list, 72);
858 r = 0;
859 }
860 mutex_unlock(&kvm->lock);
861 VM_EVENT(kvm, 3, "ENABLE: AIS %s",
862 r ? "(not available)" : "(success)");
863 break;
864 case KVM_CAP_S390_GS:
865 r = -EINVAL;
866 mutex_lock(&kvm->lock);
867 if (kvm->created_vcpus) {
868 r = -EBUSY;
869 } else if (test_facility(133)) {
870 set_kvm_facility(kvm->arch.model.fac_mask, 133);
871 set_kvm_facility(kvm->arch.model.fac_list, 133);
872 r = 0;
873 }
874 mutex_unlock(&kvm->lock);
875 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_GS %s",
876 r ? "(not available)" : "(success)");
877 break;
878 case KVM_CAP_S390_HPAGE_1M:
879 mutex_lock(&kvm->lock);
880 if (kvm->created_vcpus)
881 r = -EBUSY;
882 else if (!hpage || kvm->arch.use_cmma || kvm_is_ucontrol(kvm))
883 r = -EINVAL;
884 else {
885 r = 0;
886 set_bit(GMAP_FLAG_ALLOW_HPAGE_1M, &kvm->arch.gmap->flags);
887 /*
888 * We might have to create fake 4k page
889 * tables. To avoid that the hardware works on
890 * stale PGSTEs, we emulate these instructions.
891 */
892 kvm->arch.use_skf = 0;
893 kvm->arch.use_pfmfi = 0;
894 }
895 mutex_unlock(&kvm->lock);
896 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_HPAGE %s",
897 r ? "(not available)" : "(success)");
898 break;
899 case KVM_CAP_S390_USER_STSI:
900 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_STSI");
901 kvm->arch.user_stsi = 1;
902 r = 0;
903 break;
904 case KVM_CAP_S390_USER_INSTR0:
905 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_INSTR0");
906 kvm->arch.user_instr0 = 1;
907 icpt_operexc_on_all_vcpus(kvm);
908 r = 0;
909 break;
910 case KVM_CAP_S390_CPU_TOPOLOGY:
911 r = -EINVAL;
912 mutex_lock(&kvm->lock);
913 if (kvm->created_vcpus) {
914 r = -EBUSY;
915 } else if (test_facility(11)) {
916 set_kvm_facility(kvm->arch.model.fac_mask, 11);
917 set_kvm_facility(kvm->arch.model.fac_list, 11);
918 r = 0;
919 }
920 mutex_unlock(&kvm->lock);
921 VM_EVENT(kvm, 3, "ENABLE: CAP_S390_CPU_TOPOLOGY %s",
922 r ? "(not available)" : "(success)");
923 break;
924 case KVM_CAP_S390_USER_OPEREXEC:
925 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_USER_OPEREXEC");
926 kvm->arch.user_operexec = 1;
927 icpt_operexc_on_all_vcpus(kvm);
928 r = 0;
929 break;
930 case KVM_CAP_S390_VSIE_ESAMODE:
931 VM_EVENT(kvm, 3, "%s", "ENABLE: CAP_S390_VSIE_ESAMODE");
932 kvm->arch.allow_vsie_esamode = 1;
933 r = 0;
934 break;
935 default:
936 r = -EINVAL;
937 break;
938 }
939 return r;
940 }
941
kvm_s390_get_mem_control(struct kvm * kvm,struct kvm_device_attr * attr)942 static int kvm_s390_get_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
943 {
944 int ret;
945
946 switch (attr->attr) {
947 case KVM_S390_VM_MEM_LIMIT_SIZE:
948 ret = 0;
949 VM_EVENT(kvm, 3, "QUERY: max guest memory: %lu bytes",
950 kvm->arch.mem_limit);
951 if (put_user(kvm->arch.mem_limit, (u64 __user *)attr->addr))
952 ret = -EFAULT;
953 break;
954 default:
955 ret = -ENXIO;
956 break;
957 }
958 return ret;
959 }
960
kvm_s390_set_mem_control(struct kvm * kvm,struct kvm_device_attr * attr)961 static int kvm_s390_set_mem_control(struct kvm *kvm, struct kvm_device_attr *attr)
962 {
963 int ret;
964
965 switch (attr->attr) {
966 case KVM_S390_VM_MEM_ENABLE_CMMA:
967 ret = -ENXIO;
968 if (!sclp.has_cmma)
969 break;
970
971 VM_EVENT(kvm, 3, "%s", "ENABLE: CMMA support");
972 mutex_lock(&kvm->lock);
973 if (kvm->created_vcpus)
974 ret = -EBUSY;
975 else {
976 kvm->arch.use_cmma = 1;
977 /* Not compatible with cmma. */
978 kvm->arch.use_pfmfi = 0;
979 ret = 0;
980 }
981 mutex_unlock(&kvm->lock);
982 break;
983 case KVM_S390_VM_MEM_CLR_CMMA: {
984 gfn_t start_gfn = 0;
985
986 ret = -ENXIO;
987 if (!sclp.has_cmma)
988 break;
989 ret = -EINVAL;
990 if (!kvm->arch.use_cmma)
991 break;
992
993 VM_EVENT(kvm, 3, "%s", "RESET: CMMA states");
994 do {
995 start_gfn = dat_reset_cmma(kvm->arch.gmap->asce, start_gfn);
996 cond_resched();
997 } while (start_gfn);
998 ret = 0;
999 break;
1000 }
1001 case KVM_S390_VM_MEM_LIMIT_SIZE: {
1002 struct kvm_memslots *slots;
1003 struct kvm_memory_slot *ms;
1004 unsigned long new_limit;
1005 int bkt;
1006
1007 if (kvm_is_ucontrol(kvm))
1008 return -EINVAL;
1009
1010 if (get_user(new_limit, (u64 __user *)attr->addr))
1011 return -EFAULT;
1012
1013 guard(mutex)(&kvm->lock);
1014
1015 new_limit = ALIGN(new_limit, HPAGE_SIZE);
1016 if (kvm->arch.mem_limit != KVM_S390_NO_MEM_LIMIT &&
1017 new_limit > kvm->arch.mem_limit)
1018 return -E2BIG;
1019
1020 if (!new_limit)
1021 return -EINVAL;
1022
1023 if (kvm->created_vcpus)
1024 return -EBUSY;
1025
1026 ret = 0;
1027 scoped_guard(mutex, &kvm->slots_lock) {
1028 slots = kvm_memslots(kvm);
1029 if (slots && !kvm_memslots_empty(slots)) {
1030 kvm_for_each_memslot(ms, bkt, slots) {
1031 if (gpa_to_gfn(new_limit) < ms->base_gfn + ms->npages) {
1032 ret = -EBUSY;
1033 break;
1034 }
1035 }
1036 }
1037 if (!ret)
1038 ret = gmap_set_limit(kvm->arch.gmap, gpa_to_gfn(new_limit));
1039 }
1040 if (ret)
1041 break;
1042 VM_EVENT(kvm, 3, "SET: max guest address: %lu", new_limit);
1043 VM_EVENT(kvm, 3, "New guest asce: 0x%p", (void *)kvm->arch.gmap->asce.val);
1044 break;
1045 }
1046 default:
1047 ret = -ENXIO;
1048 break;
1049 }
1050 return ret;
1051 }
1052
1053 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu);
1054
kvm_s390_vcpu_crypto_reset_all(struct kvm * kvm)1055 void kvm_s390_vcpu_crypto_reset_all(struct kvm *kvm)
1056 {
1057 struct kvm_vcpu *vcpu;
1058 unsigned long i;
1059
1060 kvm_s390_vcpu_block_all(kvm);
1061
1062 kvm_for_each_vcpu(i, vcpu, kvm) {
1063 kvm_s390_vcpu_crypto_setup(vcpu);
1064 /* recreate the shadow crycb by leaving the VSIE handler */
1065 kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu);
1066 }
1067
1068 kvm_s390_vcpu_unblock_all(kvm);
1069 }
1070
kvm_s390_vm_set_crypto(struct kvm * kvm,struct kvm_device_attr * attr)1071 static int kvm_s390_vm_set_crypto(struct kvm *kvm, struct kvm_device_attr *attr)
1072 {
1073 mutex_lock(&kvm->lock);
1074 switch (attr->attr) {
1075 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
1076 if (!test_kvm_facility(kvm, 76)) {
1077 mutex_unlock(&kvm->lock);
1078 return -EINVAL;
1079 }
1080 get_random_bytes(
1081 kvm->arch.crypto.crycb->aes_wrapping_key_mask,
1082 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
1083 kvm->arch.crypto.aes_kw = 1;
1084 VM_EVENT(kvm, 3, "%s", "ENABLE: AES keywrapping support");
1085 break;
1086 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
1087 if (!test_kvm_facility(kvm, 76)) {
1088 mutex_unlock(&kvm->lock);
1089 return -EINVAL;
1090 }
1091 get_random_bytes(
1092 kvm->arch.crypto.crycb->dea_wrapping_key_mask,
1093 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
1094 kvm->arch.crypto.dea_kw = 1;
1095 VM_EVENT(kvm, 3, "%s", "ENABLE: DEA keywrapping support");
1096 break;
1097 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
1098 if (!test_kvm_facility(kvm, 76)) {
1099 mutex_unlock(&kvm->lock);
1100 return -EINVAL;
1101 }
1102 kvm->arch.crypto.aes_kw = 0;
1103 memset(kvm->arch.crypto.crycb->aes_wrapping_key_mask, 0,
1104 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
1105 VM_EVENT(kvm, 3, "%s", "DISABLE: AES keywrapping support");
1106 break;
1107 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
1108 if (!test_kvm_facility(kvm, 76)) {
1109 mutex_unlock(&kvm->lock);
1110 return -EINVAL;
1111 }
1112 kvm->arch.crypto.dea_kw = 0;
1113 memset(kvm->arch.crypto.crycb->dea_wrapping_key_mask, 0,
1114 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
1115 VM_EVENT(kvm, 3, "%s", "DISABLE: DEA keywrapping support");
1116 break;
1117 case KVM_S390_VM_CRYPTO_ENABLE_APIE:
1118 if (!ap_instructions_available()) {
1119 mutex_unlock(&kvm->lock);
1120 return -EOPNOTSUPP;
1121 }
1122 kvm->arch.crypto.apie = 1;
1123 break;
1124 case KVM_S390_VM_CRYPTO_DISABLE_APIE:
1125 if (!ap_instructions_available()) {
1126 mutex_unlock(&kvm->lock);
1127 return -EOPNOTSUPP;
1128 }
1129 kvm->arch.crypto.apie = 0;
1130 break;
1131 default:
1132 mutex_unlock(&kvm->lock);
1133 return -ENXIO;
1134 }
1135
1136 kvm_s390_vcpu_crypto_reset_all(kvm);
1137 mutex_unlock(&kvm->lock);
1138 return 0;
1139 }
1140
kvm_s390_vcpu_pci_setup(struct kvm_vcpu * vcpu)1141 static void kvm_s390_vcpu_pci_setup(struct kvm_vcpu *vcpu)
1142 {
1143 /* Only set the ECB bits after guest requests zPCI interpretation */
1144 if (!vcpu->kvm->arch.use_zpci_interp)
1145 return;
1146
1147 vcpu->arch.sie_block->ecb2 |= ECB2_ZPCI_LSI;
1148 vcpu->arch.sie_block->ecb3 |= ECB3_AISII + ECB3_AISI;
1149 }
1150
kvm_s390_vcpu_pci_enable_interp(struct kvm * kvm)1151 void kvm_s390_vcpu_pci_enable_interp(struct kvm *kvm)
1152 {
1153 struct kvm_vcpu *vcpu;
1154 unsigned long i;
1155
1156 lockdep_assert_held(&kvm->lock);
1157
1158 if (!kvm_s390_pci_interp_allowed())
1159 return;
1160
1161 /*
1162 * If host is configured for PCI and the necessary facilities are
1163 * available, turn on interpretation for the life of this guest
1164 */
1165 kvm->arch.use_zpci_interp = 1;
1166
1167 kvm_s390_vcpu_block_all(kvm);
1168
1169 kvm_for_each_vcpu(i, vcpu, kvm) {
1170 kvm_s390_vcpu_pci_setup(vcpu);
1171 kvm_s390_sync_request(KVM_REQ_VSIE_RESTART, vcpu);
1172 }
1173
1174 kvm_s390_vcpu_unblock_all(kvm);
1175 }
1176
kvm_s390_sync_request_broadcast(struct kvm * kvm,int req)1177 static void kvm_s390_sync_request_broadcast(struct kvm *kvm, int req)
1178 {
1179 unsigned long cx;
1180 struct kvm_vcpu *vcpu;
1181
1182 kvm_for_each_vcpu(cx, vcpu, kvm)
1183 kvm_s390_sync_request(req, vcpu);
1184 }
1185
1186 /*
1187 * Must be called with kvm->srcu held to avoid races on memslots, and with
1188 * kvm->slots_lock to avoid races with ourselves and kvm_s390_vm_stop_migration.
1189 */
kvm_s390_vm_start_migration(struct kvm * kvm)1190 static int kvm_s390_vm_start_migration(struct kvm *kvm)
1191 {
1192 struct kvm_memory_slot *ms;
1193 struct kvm_memslots *slots;
1194 unsigned long ram_pages = 0;
1195 int bkt;
1196
1197 /* migration mode already enabled */
1198 if (kvm->arch.migration_mode)
1199 return 0;
1200 slots = kvm_memslots(kvm);
1201 if (!slots || kvm_memslots_empty(slots))
1202 return -EINVAL;
1203
1204 if (!kvm->arch.use_cmma) {
1205 kvm->arch.migration_mode = 1;
1206 return 0;
1207 }
1208 kvm_for_each_memslot(ms, bkt, slots) {
1209 if (!ms->dirty_bitmap)
1210 return -EINVAL;
1211 ram_pages += ms->npages;
1212 }
1213 /* mark all the pages as dirty */
1214 gmap_set_cmma_all_dirty(kvm->arch.gmap);
1215 atomic64_set(&kvm->arch.cmma_dirty_pages, ram_pages);
1216 kvm->arch.migration_mode = 1;
1217 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_START_MIGRATION);
1218 return 0;
1219 }
1220
1221 /*
1222 * Must be called with kvm->slots_lock to avoid races with ourselves and
1223 * kvm_s390_vm_start_migration.
1224 */
kvm_s390_vm_stop_migration(struct kvm * kvm)1225 static int kvm_s390_vm_stop_migration(struct kvm *kvm)
1226 {
1227 /* migration mode already disabled */
1228 if (!kvm->arch.migration_mode)
1229 return 0;
1230 kvm->arch.migration_mode = 0;
1231 if (kvm->arch.use_cmma)
1232 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_STOP_MIGRATION);
1233 return 0;
1234 }
1235
kvm_s390_vm_set_migration(struct kvm * kvm,struct kvm_device_attr * attr)1236 static int kvm_s390_vm_set_migration(struct kvm *kvm,
1237 struct kvm_device_attr *attr)
1238 {
1239 int res = -ENXIO;
1240
1241 mutex_lock(&kvm->slots_lock);
1242 switch (attr->attr) {
1243 case KVM_S390_VM_MIGRATION_START:
1244 res = kvm_s390_vm_start_migration(kvm);
1245 break;
1246 case KVM_S390_VM_MIGRATION_STOP:
1247 res = kvm_s390_vm_stop_migration(kvm);
1248 break;
1249 default:
1250 break;
1251 }
1252 mutex_unlock(&kvm->slots_lock);
1253
1254 return res;
1255 }
1256
kvm_s390_vm_get_migration(struct kvm * kvm,struct kvm_device_attr * attr)1257 static int kvm_s390_vm_get_migration(struct kvm *kvm,
1258 struct kvm_device_attr *attr)
1259 {
1260 u64 mig = kvm->arch.migration_mode;
1261
1262 if (attr->attr != KVM_S390_VM_MIGRATION_STATUS)
1263 return -ENXIO;
1264
1265 if (copy_to_user((void __user *)attr->addr, &mig, sizeof(mig)))
1266 return -EFAULT;
1267 return 0;
1268 }
1269
1270 static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod);
1271
kvm_s390_set_tod_ext(struct kvm * kvm,struct kvm_device_attr * attr)1272 static int kvm_s390_set_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
1273 {
1274 struct kvm_s390_vm_tod_clock gtod;
1275
1276 if (copy_from_user(>od, (void __user *)attr->addr, sizeof(gtod)))
1277 return -EFAULT;
1278
1279 if (!test_kvm_facility(kvm, 139) && gtod.epoch_idx)
1280 return -EINVAL;
1281 __kvm_s390_set_tod_clock(kvm, >od);
1282
1283 VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x, TOD base: 0x%llx",
1284 gtod.epoch_idx, gtod.tod);
1285
1286 return 0;
1287 }
1288
kvm_s390_set_tod_high(struct kvm * kvm,struct kvm_device_attr * attr)1289 static int kvm_s390_set_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
1290 {
1291 u8 gtod_high;
1292
1293 if (copy_from_user(>od_high, (void __user *)attr->addr,
1294 sizeof(gtod_high)))
1295 return -EFAULT;
1296
1297 if (gtod_high != 0)
1298 return -EINVAL;
1299 VM_EVENT(kvm, 3, "SET: TOD extension: 0x%x", gtod_high);
1300
1301 return 0;
1302 }
1303
kvm_s390_set_tod_low(struct kvm * kvm,struct kvm_device_attr * attr)1304 static int kvm_s390_set_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
1305 {
1306 struct kvm_s390_vm_tod_clock gtod = { 0 };
1307
1308 if (copy_from_user(>od.tod, (void __user *)attr->addr,
1309 sizeof(gtod.tod)))
1310 return -EFAULT;
1311
1312 __kvm_s390_set_tod_clock(kvm, >od);
1313 VM_EVENT(kvm, 3, "SET: TOD base: 0x%llx", gtod.tod);
1314 return 0;
1315 }
1316
kvm_s390_set_tod(struct kvm * kvm,struct kvm_device_attr * attr)1317 static int kvm_s390_set_tod(struct kvm *kvm, struct kvm_device_attr *attr)
1318 {
1319 int ret;
1320
1321 if (attr->flags)
1322 return -EINVAL;
1323
1324 mutex_lock(&kvm->lock);
1325 /*
1326 * For protected guests, the TOD is managed by the ultravisor, so trying
1327 * to change it will never bring the expected results.
1328 */
1329 if (kvm_s390_pv_is_protected(kvm)) {
1330 ret = -EOPNOTSUPP;
1331 goto out_unlock;
1332 }
1333
1334 switch (attr->attr) {
1335 case KVM_S390_VM_TOD_EXT:
1336 ret = kvm_s390_set_tod_ext(kvm, attr);
1337 break;
1338 case KVM_S390_VM_TOD_HIGH:
1339 ret = kvm_s390_set_tod_high(kvm, attr);
1340 break;
1341 case KVM_S390_VM_TOD_LOW:
1342 ret = kvm_s390_set_tod_low(kvm, attr);
1343 break;
1344 default:
1345 ret = -ENXIO;
1346 break;
1347 }
1348
1349 out_unlock:
1350 mutex_unlock(&kvm->lock);
1351 return ret;
1352 }
1353
kvm_s390_get_tod_clock(struct kvm * kvm,struct kvm_s390_vm_tod_clock * gtod)1354 static void kvm_s390_get_tod_clock(struct kvm *kvm,
1355 struct kvm_s390_vm_tod_clock *gtod)
1356 {
1357 union tod_clock clk;
1358
1359 preempt_disable();
1360
1361 store_tod_clock_ext(&clk);
1362
1363 gtod->tod = clk.tod + kvm->arch.epoch;
1364 gtod->epoch_idx = 0;
1365 if (test_kvm_facility(kvm, 139)) {
1366 gtod->epoch_idx = clk.ei + kvm->arch.epdx;
1367 if (gtod->tod < clk.tod)
1368 gtod->epoch_idx += 1;
1369 }
1370
1371 preempt_enable();
1372 }
1373
kvm_s390_get_tod_ext(struct kvm * kvm,struct kvm_device_attr * attr)1374 static int kvm_s390_get_tod_ext(struct kvm *kvm, struct kvm_device_attr *attr)
1375 {
1376 struct kvm_s390_vm_tod_clock gtod;
1377
1378 memset(>od, 0, sizeof(gtod));
1379 kvm_s390_get_tod_clock(kvm, >od);
1380 if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod)))
1381 return -EFAULT;
1382
1383 VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x, TOD base: 0x%llx",
1384 gtod.epoch_idx, gtod.tod);
1385 return 0;
1386 }
1387
kvm_s390_get_tod_high(struct kvm * kvm,struct kvm_device_attr * attr)1388 static int kvm_s390_get_tod_high(struct kvm *kvm, struct kvm_device_attr *attr)
1389 {
1390 u8 gtod_high = 0;
1391
1392 if (copy_to_user((void __user *)attr->addr, >od_high,
1393 sizeof(gtod_high)))
1394 return -EFAULT;
1395 VM_EVENT(kvm, 3, "QUERY: TOD extension: 0x%x", gtod_high);
1396
1397 return 0;
1398 }
1399
kvm_s390_get_tod_low(struct kvm * kvm,struct kvm_device_attr * attr)1400 static int kvm_s390_get_tod_low(struct kvm *kvm, struct kvm_device_attr *attr)
1401 {
1402 u64 gtod;
1403
1404 gtod = kvm_s390_get_tod_clock_fast(kvm);
1405 if (copy_to_user((void __user *)attr->addr, >od, sizeof(gtod)))
1406 return -EFAULT;
1407 VM_EVENT(kvm, 3, "QUERY: TOD base: 0x%llx", gtod);
1408
1409 return 0;
1410 }
1411
kvm_s390_get_tod(struct kvm * kvm,struct kvm_device_attr * attr)1412 static int kvm_s390_get_tod(struct kvm *kvm, struct kvm_device_attr *attr)
1413 {
1414 int ret;
1415
1416 if (attr->flags)
1417 return -EINVAL;
1418
1419 switch (attr->attr) {
1420 case KVM_S390_VM_TOD_EXT:
1421 ret = kvm_s390_get_tod_ext(kvm, attr);
1422 break;
1423 case KVM_S390_VM_TOD_HIGH:
1424 ret = kvm_s390_get_tod_high(kvm, attr);
1425 break;
1426 case KVM_S390_VM_TOD_LOW:
1427 ret = kvm_s390_get_tod_low(kvm, attr);
1428 break;
1429 default:
1430 ret = -ENXIO;
1431 break;
1432 }
1433 return ret;
1434 }
1435
kvm_s390_set_processor(struct kvm * kvm,struct kvm_device_attr * attr)1436 static int kvm_s390_set_processor(struct kvm *kvm, struct kvm_device_attr *attr)
1437 {
1438 struct kvm_s390_vm_cpu_processor *proc;
1439 u16 lowest_ibc, unblocked_ibc;
1440 int ret = 0;
1441
1442 mutex_lock(&kvm->lock);
1443 if (kvm->created_vcpus) {
1444 ret = -EBUSY;
1445 goto out;
1446 }
1447 proc = kzalloc_obj(*proc, GFP_KERNEL_ACCOUNT);
1448 if (!proc) {
1449 ret = -ENOMEM;
1450 goto out;
1451 }
1452 if (!copy_from_user(proc, (void __user *)attr->addr,
1453 sizeof(*proc))) {
1454 kvm->arch.model.cpuid = proc->cpuid;
1455 lowest_ibc = sclp.ibc >> 16 & 0xfff;
1456 unblocked_ibc = sclp.ibc & 0xfff;
1457 if (lowest_ibc && proc->ibc) {
1458 if (proc->ibc > unblocked_ibc)
1459 kvm->arch.model.ibc = unblocked_ibc;
1460 else if (proc->ibc < lowest_ibc)
1461 kvm->arch.model.ibc = lowest_ibc;
1462 else
1463 kvm->arch.model.ibc = proc->ibc;
1464 }
1465 memcpy(kvm->arch.model.fac_list, proc->fac_list,
1466 S390_ARCH_FAC_LIST_SIZE_BYTE);
1467 VM_EVENT(kvm, 3, "SET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
1468 kvm->arch.model.ibc,
1469 kvm->arch.model.cpuid);
1470 VM_EVENT(kvm, 3, "SET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1471 kvm->arch.model.fac_list[0],
1472 kvm->arch.model.fac_list[1],
1473 kvm->arch.model.fac_list[2]);
1474 } else
1475 ret = -EFAULT;
1476 kfree(proc);
1477 out:
1478 mutex_unlock(&kvm->lock);
1479 return ret;
1480 }
1481
kvm_s390_set_processor_feat(struct kvm * kvm,struct kvm_device_attr * attr)1482 static int kvm_s390_set_processor_feat(struct kvm *kvm,
1483 struct kvm_device_attr *attr)
1484 {
1485 struct kvm_s390_vm_cpu_feat data;
1486
1487 if (copy_from_user(&data, (void __user *)attr->addr, sizeof(data)))
1488 return -EFAULT;
1489 if (!bitmap_subset((unsigned long *) data.feat,
1490 kvm_s390_available_cpu_feat,
1491 KVM_S390_VM_CPU_FEAT_NR_BITS))
1492 return -EINVAL;
1493
1494 mutex_lock(&kvm->lock);
1495 if (kvm->created_vcpus) {
1496 mutex_unlock(&kvm->lock);
1497 return -EBUSY;
1498 }
1499 bitmap_from_arr64(kvm->arch.cpu_feat, data.feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
1500 mutex_unlock(&kvm->lock);
1501 VM_EVENT(kvm, 3, "SET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
1502 data.feat[0],
1503 data.feat[1],
1504 data.feat[2]);
1505 return 0;
1506 }
1507
kvm_s390_set_processor_subfunc(struct kvm * kvm,struct kvm_device_attr * attr)1508 static int kvm_s390_set_processor_subfunc(struct kvm *kvm,
1509 struct kvm_device_attr *attr)
1510 {
1511 mutex_lock(&kvm->lock);
1512 if (kvm->created_vcpus) {
1513 mutex_unlock(&kvm->lock);
1514 return -EBUSY;
1515 }
1516
1517 if (copy_from_user(&kvm->arch.model.subfuncs, (void __user *)attr->addr,
1518 sizeof(struct kvm_s390_vm_cpu_subfunc))) {
1519 mutex_unlock(&kvm->lock);
1520 return -EFAULT;
1521 }
1522 mutex_unlock(&kvm->lock);
1523
1524 VM_EVENT(kvm, 3, "SET: guest PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1525 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
1526 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
1527 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
1528 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
1529 VM_EVENT(kvm, 3, "SET: guest PTFF subfunc 0x%16.16lx.%16.16lx",
1530 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
1531 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
1532 VM_EVENT(kvm, 3, "SET: guest KMAC subfunc 0x%16.16lx.%16.16lx",
1533 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
1534 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
1535 VM_EVENT(kvm, 3, "SET: guest KMC subfunc 0x%16.16lx.%16.16lx",
1536 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
1537 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
1538 VM_EVENT(kvm, 3, "SET: guest KM subfunc 0x%16.16lx.%16.16lx",
1539 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
1540 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
1541 VM_EVENT(kvm, 3, "SET: guest KIMD subfunc 0x%16.16lx.%16.16lx",
1542 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
1543 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
1544 VM_EVENT(kvm, 3, "SET: guest KLMD subfunc 0x%16.16lx.%16.16lx",
1545 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
1546 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
1547 VM_EVENT(kvm, 3, "SET: guest PCKMO subfunc 0x%16.16lx.%16.16lx",
1548 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
1549 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
1550 VM_EVENT(kvm, 3, "SET: guest KMCTR subfunc 0x%16.16lx.%16.16lx",
1551 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
1552 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
1553 VM_EVENT(kvm, 3, "SET: guest KMF subfunc 0x%16.16lx.%16.16lx",
1554 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
1555 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
1556 VM_EVENT(kvm, 3, "SET: guest KMO subfunc 0x%16.16lx.%16.16lx",
1557 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
1558 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
1559 VM_EVENT(kvm, 3, "SET: guest PCC subfunc 0x%16.16lx.%16.16lx",
1560 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
1561 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
1562 VM_EVENT(kvm, 3, "SET: guest PPNO subfunc 0x%16.16lx.%16.16lx",
1563 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
1564 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
1565 VM_EVENT(kvm, 3, "SET: guest KMA subfunc 0x%16.16lx.%16.16lx",
1566 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
1567 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
1568 VM_EVENT(kvm, 3, "SET: guest KDSA subfunc 0x%16.16lx.%16.16lx",
1569 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0],
1570 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]);
1571 VM_EVENT(kvm, 3, "SET: guest SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1572 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0],
1573 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1],
1574 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2],
1575 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]);
1576 VM_EVENT(kvm, 3, "SET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1577 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0],
1578 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
1579 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
1580 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);
1581 VM_EVENT(kvm, 3, "GET: guest PFCR subfunc 0x%16.16lx.%16.16lx",
1582 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[0],
1583 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[1]);
1584
1585 return 0;
1586 }
1587
1588 #define KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK \
1589 ( \
1590 ((struct kvm_s390_vm_cpu_uv_feat){ \
1591 .ap = 1, \
1592 .ap_intr = 1, \
1593 }) \
1594 .feat \
1595 )
1596
kvm_s390_set_uv_feat(struct kvm * kvm,struct kvm_device_attr * attr)1597 static int kvm_s390_set_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr)
1598 {
1599 struct kvm_s390_vm_cpu_uv_feat __user *ptr = (void __user *)attr->addr;
1600 unsigned long data, filter;
1601
1602 filter = uv_info.uv_feature_indications & KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK;
1603 if (get_user(data, &ptr->feat))
1604 return -EFAULT;
1605 if (!bitmap_subset(&data, &filter, KVM_S390_VM_CPU_UV_FEAT_NR_BITS))
1606 return -EINVAL;
1607
1608 mutex_lock(&kvm->lock);
1609 if (kvm->created_vcpus) {
1610 mutex_unlock(&kvm->lock);
1611 return -EBUSY;
1612 }
1613 kvm->arch.model.uv_feat_guest.feat = data;
1614 mutex_unlock(&kvm->lock);
1615
1616 VM_EVENT(kvm, 3, "SET: guest UV-feat: 0x%16.16lx", data);
1617
1618 return 0;
1619 }
1620
kvm_s390_set_cpu_model(struct kvm * kvm,struct kvm_device_attr * attr)1621 static int kvm_s390_set_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
1622 {
1623 int ret = -ENXIO;
1624
1625 switch (attr->attr) {
1626 case KVM_S390_VM_CPU_PROCESSOR:
1627 ret = kvm_s390_set_processor(kvm, attr);
1628 break;
1629 case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1630 ret = kvm_s390_set_processor_feat(kvm, attr);
1631 break;
1632 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1633 ret = kvm_s390_set_processor_subfunc(kvm, attr);
1634 break;
1635 case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST:
1636 ret = kvm_s390_set_uv_feat(kvm, attr);
1637 break;
1638 }
1639 return ret;
1640 }
1641
kvm_s390_get_processor(struct kvm * kvm,struct kvm_device_attr * attr)1642 static int kvm_s390_get_processor(struct kvm *kvm, struct kvm_device_attr *attr)
1643 {
1644 struct kvm_s390_vm_cpu_processor *proc;
1645 int ret = 0;
1646
1647 proc = kzalloc_obj(*proc, GFP_KERNEL_ACCOUNT);
1648 if (!proc) {
1649 ret = -ENOMEM;
1650 goto out;
1651 }
1652 proc->cpuid = kvm->arch.model.cpuid;
1653 proc->ibc = kvm->arch.model.ibc;
1654 memcpy(&proc->fac_list, kvm->arch.model.fac_list,
1655 S390_ARCH_FAC_LIST_SIZE_BYTE);
1656 VM_EVENT(kvm, 3, "GET: guest ibc: 0x%4.4x, guest cpuid: 0x%16.16llx",
1657 kvm->arch.model.ibc,
1658 kvm->arch.model.cpuid);
1659 VM_EVENT(kvm, 3, "GET: guest faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1660 kvm->arch.model.fac_list[0],
1661 kvm->arch.model.fac_list[1],
1662 kvm->arch.model.fac_list[2]);
1663 if (copy_to_user((void __user *)attr->addr, proc, sizeof(*proc)))
1664 ret = -EFAULT;
1665 kfree(proc);
1666 out:
1667 return ret;
1668 }
1669
kvm_s390_get_machine(struct kvm * kvm,struct kvm_device_attr * attr)1670 static int kvm_s390_get_machine(struct kvm *kvm, struct kvm_device_attr *attr)
1671 {
1672 struct kvm_s390_vm_cpu_machine *mach;
1673 int ret = 0;
1674
1675 mach = kzalloc_obj(*mach, GFP_KERNEL_ACCOUNT);
1676 if (!mach) {
1677 ret = -ENOMEM;
1678 goto out;
1679 }
1680 get_cpu_id((struct cpuid *) &mach->cpuid);
1681 mach->ibc = sclp.ibc;
1682 memcpy(&mach->fac_mask, kvm->arch.model.fac_mask,
1683 S390_ARCH_FAC_LIST_SIZE_BYTE);
1684 memcpy((unsigned long *)&mach->fac_list, stfle_fac_list,
1685 sizeof(stfle_fac_list));
1686 VM_EVENT(kvm, 3, "GET: host ibc: 0x%4.4x, host cpuid: 0x%16.16llx",
1687 kvm->arch.model.ibc,
1688 kvm->arch.model.cpuid);
1689 VM_EVENT(kvm, 3, "GET: host facmask: 0x%16.16llx.%16.16llx.%16.16llx",
1690 mach->fac_mask[0],
1691 mach->fac_mask[1],
1692 mach->fac_mask[2]);
1693 VM_EVENT(kvm, 3, "GET: host faclist: 0x%16.16llx.%16.16llx.%16.16llx",
1694 mach->fac_list[0],
1695 mach->fac_list[1],
1696 mach->fac_list[2]);
1697 if (copy_to_user((void __user *)attr->addr, mach, sizeof(*mach)))
1698 ret = -EFAULT;
1699 kfree(mach);
1700 out:
1701 return ret;
1702 }
1703
kvm_s390_get_processor_feat(struct kvm * kvm,struct kvm_device_attr * attr)1704 static int kvm_s390_get_processor_feat(struct kvm *kvm,
1705 struct kvm_device_attr *attr)
1706 {
1707 struct kvm_s390_vm_cpu_feat data;
1708
1709 bitmap_to_arr64(data.feat, kvm->arch.cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
1710 if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
1711 return -EFAULT;
1712 VM_EVENT(kvm, 3, "GET: guest feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
1713 data.feat[0],
1714 data.feat[1],
1715 data.feat[2]);
1716 return 0;
1717 }
1718
kvm_s390_get_machine_feat(struct kvm * kvm,struct kvm_device_attr * attr)1719 static int kvm_s390_get_machine_feat(struct kvm *kvm,
1720 struct kvm_device_attr *attr)
1721 {
1722 struct kvm_s390_vm_cpu_feat data;
1723
1724 bitmap_to_arr64(data.feat, kvm_s390_available_cpu_feat, KVM_S390_VM_CPU_FEAT_NR_BITS);
1725 if (copy_to_user((void __user *)attr->addr, &data, sizeof(data)))
1726 return -EFAULT;
1727 VM_EVENT(kvm, 3, "GET: host feat: 0x%16.16llx.0x%16.16llx.0x%16.16llx",
1728 data.feat[0],
1729 data.feat[1],
1730 data.feat[2]);
1731 return 0;
1732 }
1733
kvm_s390_get_processor_subfunc(struct kvm * kvm,struct kvm_device_attr * attr)1734 static int kvm_s390_get_processor_subfunc(struct kvm *kvm,
1735 struct kvm_device_attr *attr)
1736 {
1737 if (copy_to_user((void __user *)attr->addr, &kvm->arch.model.subfuncs,
1738 sizeof(struct kvm_s390_vm_cpu_subfunc)))
1739 return -EFAULT;
1740
1741 VM_EVENT(kvm, 3, "GET: guest PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1742 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[0],
1743 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[1],
1744 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[2],
1745 ((unsigned long *) &kvm->arch.model.subfuncs.plo)[3]);
1746 VM_EVENT(kvm, 3, "GET: guest PTFF subfunc 0x%16.16lx.%16.16lx",
1747 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[0],
1748 ((unsigned long *) &kvm->arch.model.subfuncs.ptff)[1]);
1749 VM_EVENT(kvm, 3, "GET: guest KMAC subfunc 0x%16.16lx.%16.16lx",
1750 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[0],
1751 ((unsigned long *) &kvm->arch.model.subfuncs.kmac)[1]);
1752 VM_EVENT(kvm, 3, "GET: guest KMC subfunc 0x%16.16lx.%16.16lx",
1753 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[0],
1754 ((unsigned long *) &kvm->arch.model.subfuncs.kmc)[1]);
1755 VM_EVENT(kvm, 3, "GET: guest KM subfunc 0x%16.16lx.%16.16lx",
1756 ((unsigned long *) &kvm->arch.model.subfuncs.km)[0],
1757 ((unsigned long *) &kvm->arch.model.subfuncs.km)[1]);
1758 VM_EVENT(kvm, 3, "GET: guest KIMD subfunc 0x%16.16lx.%16.16lx",
1759 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[0],
1760 ((unsigned long *) &kvm->arch.model.subfuncs.kimd)[1]);
1761 VM_EVENT(kvm, 3, "GET: guest KLMD subfunc 0x%16.16lx.%16.16lx",
1762 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[0],
1763 ((unsigned long *) &kvm->arch.model.subfuncs.klmd)[1]);
1764 VM_EVENT(kvm, 3, "GET: guest PCKMO subfunc 0x%16.16lx.%16.16lx",
1765 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[0],
1766 ((unsigned long *) &kvm->arch.model.subfuncs.pckmo)[1]);
1767 VM_EVENT(kvm, 3, "GET: guest KMCTR subfunc 0x%16.16lx.%16.16lx",
1768 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[0],
1769 ((unsigned long *) &kvm->arch.model.subfuncs.kmctr)[1]);
1770 VM_EVENT(kvm, 3, "GET: guest KMF subfunc 0x%16.16lx.%16.16lx",
1771 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[0],
1772 ((unsigned long *) &kvm->arch.model.subfuncs.kmf)[1]);
1773 VM_EVENT(kvm, 3, "GET: guest KMO subfunc 0x%16.16lx.%16.16lx",
1774 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[0],
1775 ((unsigned long *) &kvm->arch.model.subfuncs.kmo)[1]);
1776 VM_EVENT(kvm, 3, "GET: guest PCC subfunc 0x%16.16lx.%16.16lx",
1777 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[0],
1778 ((unsigned long *) &kvm->arch.model.subfuncs.pcc)[1]);
1779 VM_EVENT(kvm, 3, "GET: guest PPNO subfunc 0x%16.16lx.%16.16lx",
1780 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[0],
1781 ((unsigned long *) &kvm->arch.model.subfuncs.ppno)[1]);
1782 VM_EVENT(kvm, 3, "GET: guest KMA subfunc 0x%16.16lx.%16.16lx",
1783 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[0],
1784 ((unsigned long *) &kvm->arch.model.subfuncs.kma)[1]);
1785 VM_EVENT(kvm, 3, "GET: guest KDSA subfunc 0x%16.16lx.%16.16lx",
1786 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[0],
1787 ((unsigned long *) &kvm->arch.model.subfuncs.kdsa)[1]);
1788 VM_EVENT(kvm, 3, "GET: guest SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1789 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[0],
1790 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[1],
1791 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[2],
1792 ((unsigned long *) &kvm->arch.model.subfuncs.sortl)[3]);
1793 VM_EVENT(kvm, 3, "GET: guest DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1794 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[0],
1795 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[1],
1796 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[2],
1797 ((unsigned long *) &kvm->arch.model.subfuncs.dfltcc)[3]);
1798 VM_EVENT(kvm, 3, "GET: guest PFCR subfunc 0x%16.16lx.%16.16lx",
1799 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[0],
1800 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[1]);
1801
1802 return 0;
1803 }
1804
kvm_s390_get_machine_subfunc(struct kvm * kvm,struct kvm_device_attr * attr)1805 static int kvm_s390_get_machine_subfunc(struct kvm *kvm,
1806 struct kvm_device_attr *attr)
1807 {
1808 if (copy_to_user((void __user *)attr->addr, &kvm_s390_available_subfunc,
1809 sizeof(struct kvm_s390_vm_cpu_subfunc)))
1810 return -EFAULT;
1811
1812 VM_EVENT(kvm, 3, "GET: host PLO subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1813 ((unsigned long *) &kvm_s390_available_subfunc.plo)[0],
1814 ((unsigned long *) &kvm_s390_available_subfunc.plo)[1],
1815 ((unsigned long *) &kvm_s390_available_subfunc.plo)[2],
1816 ((unsigned long *) &kvm_s390_available_subfunc.plo)[3]);
1817 VM_EVENT(kvm, 3, "GET: host PTFF subfunc 0x%16.16lx.%16.16lx",
1818 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[0],
1819 ((unsigned long *) &kvm_s390_available_subfunc.ptff)[1]);
1820 VM_EVENT(kvm, 3, "GET: host KMAC subfunc 0x%16.16lx.%16.16lx",
1821 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[0],
1822 ((unsigned long *) &kvm_s390_available_subfunc.kmac)[1]);
1823 VM_EVENT(kvm, 3, "GET: host KMC subfunc 0x%16.16lx.%16.16lx",
1824 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[0],
1825 ((unsigned long *) &kvm_s390_available_subfunc.kmc)[1]);
1826 VM_EVENT(kvm, 3, "GET: host KM subfunc 0x%16.16lx.%16.16lx",
1827 ((unsigned long *) &kvm_s390_available_subfunc.km)[0],
1828 ((unsigned long *) &kvm_s390_available_subfunc.km)[1]);
1829 VM_EVENT(kvm, 3, "GET: host KIMD subfunc 0x%16.16lx.%16.16lx",
1830 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[0],
1831 ((unsigned long *) &kvm_s390_available_subfunc.kimd)[1]);
1832 VM_EVENT(kvm, 3, "GET: host KLMD subfunc 0x%16.16lx.%16.16lx",
1833 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[0],
1834 ((unsigned long *) &kvm_s390_available_subfunc.klmd)[1]);
1835 VM_EVENT(kvm, 3, "GET: host PCKMO subfunc 0x%16.16lx.%16.16lx",
1836 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[0],
1837 ((unsigned long *) &kvm_s390_available_subfunc.pckmo)[1]);
1838 VM_EVENT(kvm, 3, "GET: host KMCTR subfunc 0x%16.16lx.%16.16lx",
1839 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[0],
1840 ((unsigned long *) &kvm_s390_available_subfunc.kmctr)[1]);
1841 VM_EVENT(kvm, 3, "GET: host KMF subfunc 0x%16.16lx.%16.16lx",
1842 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[0],
1843 ((unsigned long *) &kvm_s390_available_subfunc.kmf)[1]);
1844 VM_EVENT(kvm, 3, "GET: host KMO subfunc 0x%16.16lx.%16.16lx",
1845 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[0],
1846 ((unsigned long *) &kvm_s390_available_subfunc.kmo)[1]);
1847 VM_EVENT(kvm, 3, "GET: host PCC subfunc 0x%16.16lx.%16.16lx",
1848 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[0],
1849 ((unsigned long *) &kvm_s390_available_subfunc.pcc)[1]);
1850 VM_EVENT(kvm, 3, "GET: host PPNO subfunc 0x%16.16lx.%16.16lx",
1851 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[0],
1852 ((unsigned long *) &kvm_s390_available_subfunc.ppno)[1]);
1853 VM_EVENT(kvm, 3, "GET: host KMA subfunc 0x%16.16lx.%16.16lx",
1854 ((unsigned long *) &kvm_s390_available_subfunc.kma)[0],
1855 ((unsigned long *) &kvm_s390_available_subfunc.kma)[1]);
1856 VM_EVENT(kvm, 3, "GET: host KDSA subfunc 0x%16.16lx.%16.16lx",
1857 ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[0],
1858 ((unsigned long *) &kvm_s390_available_subfunc.kdsa)[1]);
1859 VM_EVENT(kvm, 3, "GET: host SORTL subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1860 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[0],
1861 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[1],
1862 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[2],
1863 ((unsigned long *) &kvm_s390_available_subfunc.sortl)[3]);
1864 VM_EVENT(kvm, 3, "GET: host DFLTCC subfunc 0x%16.16lx.%16.16lx.%16.16lx.%16.16lx",
1865 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[0],
1866 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[1],
1867 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[2],
1868 ((unsigned long *) &kvm_s390_available_subfunc.dfltcc)[3]);
1869 VM_EVENT(kvm, 3, "GET: host PFCR subfunc 0x%16.16lx.%16.16lx",
1870 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[0],
1871 ((unsigned long *) &kvm_s390_available_subfunc.pfcr)[1]);
1872
1873 return 0;
1874 }
1875
kvm_s390_get_processor_uv_feat(struct kvm * kvm,struct kvm_device_attr * attr)1876 static int kvm_s390_get_processor_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr)
1877 {
1878 struct kvm_s390_vm_cpu_uv_feat __user *dst = (void __user *)attr->addr;
1879 unsigned long feat = kvm->arch.model.uv_feat_guest.feat;
1880
1881 if (put_user(feat, &dst->feat))
1882 return -EFAULT;
1883 VM_EVENT(kvm, 3, "GET: guest UV-feat: 0x%16.16lx", feat);
1884
1885 return 0;
1886 }
1887
kvm_s390_get_machine_uv_feat(struct kvm * kvm,struct kvm_device_attr * attr)1888 static int kvm_s390_get_machine_uv_feat(struct kvm *kvm, struct kvm_device_attr *attr)
1889 {
1890 struct kvm_s390_vm_cpu_uv_feat __user *dst = (void __user *)attr->addr;
1891 unsigned long feat;
1892
1893 BUILD_BUG_ON(sizeof(*dst) != sizeof(uv_info.uv_feature_indications));
1894
1895 feat = uv_info.uv_feature_indications & KVM_S390_VM_CPU_UV_FEAT_GUEST_MASK;
1896 if (put_user(feat, &dst->feat))
1897 return -EFAULT;
1898 VM_EVENT(kvm, 3, "GET: guest UV-feat: 0x%16.16lx", feat);
1899
1900 return 0;
1901 }
1902
kvm_s390_get_cpu_model(struct kvm * kvm,struct kvm_device_attr * attr)1903 static int kvm_s390_get_cpu_model(struct kvm *kvm, struct kvm_device_attr *attr)
1904 {
1905 int ret = -ENXIO;
1906
1907 switch (attr->attr) {
1908 case KVM_S390_VM_CPU_PROCESSOR:
1909 ret = kvm_s390_get_processor(kvm, attr);
1910 break;
1911 case KVM_S390_VM_CPU_MACHINE:
1912 ret = kvm_s390_get_machine(kvm, attr);
1913 break;
1914 case KVM_S390_VM_CPU_PROCESSOR_FEAT:
1915 ret = kvm_s390_get_processor_feat(kvm, attr);
1916 break;
1917 case KVM_S390_VM_CPU_MACHINE_FEAT:
1918 ret = kvm_s390_get_machine_feat(kvm, attr);
1919 break;
1920 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
1921 ret = kvm_s390_get_processor_subfunc(kvm, attr);
1922 break;
1923 case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
1924 ret = kvm_s390_get_machine_subfunc(kvm, attr);
1925 break;
1926 case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST:
1927 ret = kvm_s390_get_processor_uv_feat(kvm, attr);
1928 break;
1929 case KVM_S390_VM_CPU_MACHINE_UV_FEAT_GUEST:
1930 ret = kvm_s390_get_machine_uv_feat(kvm, attr);
1931 break;
1932 }
1933 return ret;
1934 }
1935
1936 /**
1937 * kvm_s390_update_topology_change_report - update CPU topology change report
1938 * @kvm: guest KVM description
1939 * @val: set or clear the MTCR bit
1940 *
1941 * Updates the Multiprocessor Topology-Change-Report bit to signal
1942 * the guest with a topology change.
1943 * This is only relevant if the topology facility is present.
1944 */
kvm_s390_update_topology_change_report(struct kvm * kvm,bool val)1945 static void kvm_s390_update_topology_change_report(struct kvm *kvm, bool val)
1946 {
1947 union sca_utility new, old;
1948 struct esca_block *sca;
1949
1950 sca = kvm->arch.sca;
1951 old = READ_ONCE(sca->utility);
1952 do {
1953 new = old;
1954 new.mtcr = val;
1955 } while (!try_cmpxchg(&sca->utility.val, &old.val, new.val));
1956 }
1957
kvm_s390_set_topo_change_indication(struct kvm * kvm,struct kvm_device_attr * attr)1958 static int kvm_s390_set_topo_change_indication(struct kvm *kvm,
1959 struct kvm_device_attr *attr)
1960 {
1961 if (!test_kvm_facility(kvm, 11))
1962 return -ENXIO;
1963
1964 kvm_s390_update_topology_change_report(kvm, !!attr->attr);
1965 return 0;
1966 }
1967
kvm_s390_get_topo_change_indication(struct kvm * kvm,struct kvm_device_attr * attr)1968 static int kvm_s390_get_topo_change_indication(struct kvm *kvm,
1969 struct kvm_device_attr *attr)
1970 {
1971 u8 topo;
1972
1973 if (!test_kvm_facility(kvm, 11))
1974 return -ENXIO;
1975
1976 topo = kvm->arch.sca->utility.mtcr;
1977
1978 return put_user(topo, (u8 __user *)attr->addr);
1979 }
1980
kvm_s390_vm_set_attr(struct kvm * kvm,struct kvm_device_attr * attr)1981 static int kvm_s390_vm_set_attr(struct kvm *kvm, struct kvm_device_attr *attr)
1982 {
1983 int ret;
1984
1985 switch (attr->group) {
1986 case KVM_S390_VM_MEM_CTRL:
1987 ret = kvm_s390_set_mem_control(kvm, attr);
1988 break;
1989 case KVM_S390_VM_TOD:
1990 ret = kvm_s390_set_tod(kvm, attr);
1991 break;
1992 case KVM_S390_VM_CPU_MODEL:
1993 ret = kvm_s390_set_cpu_model(kvm, attr);
1994 break;
1995 case KVM_S390_VM_CRYPTO:
1996 ret = kvm_s390_vm_set_crypto(kvm, attr);
1997 break;
1998 case KVM_S390_VM_MIGRATION:
1999 ret = kvm_s390_vm_set_migration(kvm, attr);
2000 break;
2001 case KVM_S390_VM_CPU_TOPOLOGY:
2002 ret = kvm_s390_set_topo_change_indication(kvm, attr);
2003 break;
2004 default:
2005 ret = -ENXIO;
2006 break;
2007 }
2008
2009 return ret;
2010 }
2011
kvm_s390_vm_get_attr(struct kvm * kvm,struct kvm_device_attr * attr)2012 static int kvm_s390_vm_get_attr(struct kvm *kvm, struct kvm_device_attr *attr)
2013 {
2014 int ret;
2015
2016 switch (attr->group) {
2017 case KVM_S390_VM_MEM_CTRL:
2018 ret = kvm_s390_get_mem_control(kvm, attr);
2019 break;
2020 case KVM_S390_VM_TOD:
2021 ret = kvm_s390_get_tod(kvm, attr);
2022 break;
2023 case KVM_S390_VM_CPU_MODEL:
2024 ret = kvm_s390_get_cpu_model(kvm, attr);
2025 break;
2026 case KVM_S390_VM_MIGRATION:
2027 ret = kvm_s390_vm_get_migration(kvm, attr);
2028 break;
2029 case KVM_S390_VM_CPU_TOPOLOGY:
2030 ret = kvm_s390_get_topo_change_indication(kvm, attr);
2031 break;
2032 default:
2033 ret = -ENXIO;
2034 break;
2035 }
2036
2037 return ret;
2038 }
2039
kvm_s390_vm_has_attr(struct kvm * kvm,struct kvm_device_attr * attr)2040 static int kvm_s390_vm_has_attr(struct kvm *kvm, struct kvm_device_attr *attr)
2041 {
2042 int ret;
2043
2044 switch (attr->group) {
2045 case KVM_S390_VM_MEM_CTRL:
2046 switch (attr->attr) {
2047 case KVM_S390_VM_MEM_ENABLE_CMMA:
2048 case KVM_S390_VM_MEM_CLR_CMMA:
2049 ret = sclp.has_cmma ? 0 : -ENXIO;
2050 break;
2051 case KVM_S390_VM_MEM_LIMIT_SIZE:
2052 ret = 0;
2053 break;
2054 default:
2055 ret = -ENXIO;
2056 break;
2057 }
2058 break;
2059 case KVM_S390_VM_TOD:
2060 switch (attr->attr) {
2061 case KVM_S390_VM_TOD_LOW:
2062 case KVM_S390_VM_TOD_HIGH:
2063 ret = 0;
2064 break;
2065 default:
2066 ret = -ENXIO;
2067 break;
2068 }
2069 break;
2070 case KVM_S390_VM_CPU_MODEL:
2071 switch (attr->attr) {
2072 case KVM_S390_VM_CPU_PROCESSOR:
2073 case KVM_S390_VM_CPU_MACHINE:
2074 case KVM_S390_VM_CPU_PROCESSOR_FEAT:
2075 case KVM_S390_VM_CPU_MACHINE_FEAT:
2076 case KVM_S390_VM_CPU_MACHINE_SUBFUNC:
2077 case KVM_S390_VM_CPU_PROCESSOR_SUBFUNC:
2078 case KVM_S390_VM_CPU_MACHINE_UV_FEAT_GUEST:
2079 case KVM_S390_VM_CPU_PROCESSOR_UV_FEAT_GUEST:
2080 ret = 0;
2081 break;
2082 default:
2083 ret = -ENXIO;
2084 break;
2085 }
2086 break;
2087 case KVM_S390_VM_CRYPTO:
2088 switch (attr->attr) {
2089 case KVM_S390_VM_CRYPTO_ENABLE_AES_KW:
2090 case KVM_S390_VM_CRYPTO_ENABLE_DEA_KW:
2091 case KVM_S390_VM_CRYPTO_DISABLE_AES_KW:
2092 case KVM_S390_VM_CRYPTO_DISABLE_DEA_KW:
2093 ret = 0;
2094 break;
2095 case KVM_S390_VM_CRYPTO_ENABLE_APIE:
2096 case KVM_S390_VM_CRYPTO_DISABLE_APIE:
2097 ret = ap_instructions_available() ? 0 : -ENXIO;
2098 break;
2099 default:
2100 ret = -ENXIO;
2101 break;
2102 }
2103 break;
2104 case KVM_S390_VM_MIGRATION:
2105 ret = 0;
2106 break;
2107 case KVM_S390_VM_CPU_TOPOLOGY:
2108 ret = test_kvm_facility(kvm, 11) ? 0 : -ENXIO;
2109 break;
2110 default:
2111 ret = -ENXIO;
2112 break;
2113 }
2114
2115 return ret;
2116 }
2117
kvm_s390_get_skeys(struct kvm * kvm,struct kvm_s390_skeys * args)2118 static int kvm_s390_get_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
2119 {
2120 union skey *keys;
2121 int i, r = 0;
2122
2123 if (args->flags != 0)
2124 return -EINVAL;
2125
2126 /* Is this guest using storage keys? */
2127 if (!uses_skeys(kvm->arch.gmap))
2128 return KVM_S390_GET_SKEYS_NONE;
2129
2130 /* Enforce sane limit on memory allocation */
2131 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
2132 return -EINVAL;
2133
2134 keys = kvmalloc_array(args->count, sizeof(*keys), GFP_KERNEL_ACCOUNT);
2135 if (!keys)
2136 return -ENOMEM;
2137
2138 scoped_guard(read_lock, &kvm->mmu_lock) {
2139 for (i = 0; i < args->count; i++) {
2140 r = dat_get_storage_key(kvm->arch.gmap->asce,
2141 args->start_gfn + i, keys + i);
2142 if (r)
2143 break;
2144 }
2145 }
2146
2147 if (!r) {
2148 r = copy_to_user((uint8_t __user *)args->skeydata_addr, keys,
2149 sizeof(uint8_t) * args->count);
2150 if (r)
2151 r = -EFAULT;
2152 }
2153
2154 kvfree(keys);
2155 return r;
2156 }
2157
kvm_s390_set_skeys(struct kvm * kvm,struct kvm_s390_skeys * args)2158 static int kvm_s390_set_skeys(struct kvm *kvm, struct kvm_s390_skeys *args)
2159 {
2160 struct kvm_s390_mmu_cache *mc;
2161 union skey *keys;
2162 int i, r = 0;
2163
2164 if (args->flags != 0)
2165 return -EINVAL;
2166
2167 /* Enforce sane limit on memory allocation */
2168 if (args->count < 1 || args->count > KVM_S390_SKEYS_MAX)
2169 return -EINVAL;
2170
2171 keys = kvmalloc_array(args->count, sizeof(*keys), GFP_KERNEL_ACCOUNT);
2172 if (!keys)
2173 return -ENOMEM;
2174
2175 r = copy_from_user(keys, (uint8_t __user *)args->skeydata_addr,
2176 sizeof(uint8_t) * args->count);
2177 if (r) {
2178 r = -EFAULT;
2179 goto out;
2180 }
2181
2182 /* Enable storage key handling for the guest */
2183 r = gmap_enable_skeys(kvm->arch.gmap);
2184 if (r)
2185 goto out;
2186
2187 r = -EINVAL;
2188 for (i = 0; i < args->count; i++) {
2189 /* Lowest order bit is reserved */
2190 if (keys[i].zero)
2191 goto out;
2192 }
2193
2194 mc = kvm_s390_new_mmu_cache();
2195 if (!mc) {
2196 r = -ENOMEM;
2197 goto out;
2198 }
2199
2200 r = 0;
2201 do {
2202 r = kvm_s390_mmu_cache_topup(mc);
2203 if (r == -ENOMEM)
2204 break;
2205 scoped_guard(read_lock, &kvm->mmu_lock) {
2206 for (i = 0 ; i < args->count; i++) {
2207 r = dat_set_storage_key(mc, kvm->arch.gmap->asce,
2208 args->start_gfn + i, keys[i], 0);
2209 if (r)
2210 break;
2211 }
2212 }
2213 } while (r == -ENOMEM);
2214 kvm_s390_free_mmu_cache(mc);
2215 out:
2216 kvfree(keys);
2217 return r;
2218 }
2219
2220 /*
2221 * This function searches for the next page with dirty CMMA attributes, and
2222 * saves the attributes in the buffer up to either the end of the buffer or
2223 * until a block of at least KVM_S390_MAX_BIT_DISTANCE clean bits is found;
2224 * no trailing clean bytes are saved.
2225 * In case no dirty bits were found, or if CMMA was not enabled or used, the
2226 * output buffer will indicate 0 as length.
2227 */
kvm_s390_get_cmma_bits(struct kvm * kvm,struct kvm_s390_cmma_log * args)2228 static int kvm_s390_get_cmma_bits(struct kvm *kvm,
2229 struct kvm_s390_cmma_log *args)
2230 {
2231 int peek, ret;
2232 u8 *values;
2233
2234 if (!kvm->arch.use_cmma)
2235 return -ENXIO;
2236 /* Invalid/unsupported flags were specified */
2237 if (args->flags & ~KVM_S390_CMMA_PEEK)
2238 return -EINVAL;
2239 /* Migration mode query, and we are not doing a migration */
2240 peek = !!(args->flags & KVM_S390_CMMA_PEEK);
2241 if (!peek && !kvm->arch.migration_mode)
2242 return -EINVAL;
2243 /* CMMA is disabled or was not used, or the buffer has length zero */
2244 args->count = min(args->count, KVM_S390_CMMA_SIZE_MAX);
2245 if (!args->count || !uses_cmm(kvm->arch.gmap)) {
2246 memset(args, 0, sizeof(*args));
2247 return 0;
2248 }
2249 /* We are not peeking, and there are no dirty pages */
2250 if (!peek && !atomic64_read(&kvm->arch.cmma_dirty_pages)) {
2251 memset(args, 0, sizeof(*args));
2252 return 0;
2253 }
2254
2255 values = vmalloc(args->count);
2256 if (!values)
2257 return -ENOMEM;
2258
2259 scoped_guard(read_lock, &kvm->mmu_lock) {
2260 if (peek)
2261 ret = dat_peek_cmma(args->start_gfn, kvm->arch.gmap->asce, &args->count,
2262 values);
2263 else
2264 ret = dat_get_cmma(kvm->arch.gmap->asce, &args->start_gfn, &args->count,
2265 values, &kvm->arch.cmma_dirty_pages);
2266 }
2267
2268 if (kvm->arch.migration_mode)
2269 args->remaining = atomic64_read(&kvm->arch.cmma_dirty_pages);
2270 else
2271 args->remaining = 0;
2272
2273 if (copy_to_user((void __user *)args->values, values, args->count))
2274 ret = -EFAULT;
2275
2276 vfree(values);
2277 return ret;
2278 }
2279
2280 /*
2281 * This function sets the CMMA attributes for the given pages. If the input
2282 * buffer has zero length, no action is taken, otherwise the attributes are
2283 * set and the mm->context.uses_cmm flag is set.
2284 */
kvm_s390_set_cmma_bits(struct kvm * kvm,const struct kvm_s390_cmma_log * args)2285 static int kvm_s390_set_cmma_bits(struct kvm *kvm,
2286 const struct kvm_s390_cmma_log *args)
2287 {
2288 struct kvm_s390_mmu_cache *mc;
2289 u8 *bits = NULL;
2290 int r = 0;
2291
2292 if (!kvm->arch.use_cmma)
2293 return -ENXIO;
2294 /* invalid/unsupported flags */
2295 if (args->flags != 0)
2296 return -EINVAL;
2297 /* Enforce sane limit on memory allocation */
2298 if (args->count > KVM_S390_CMMA_SIZE_MAX)
2299 return -EINVAL;
2300 /* Nothing to do */
2301 if (args->count == 0)
2302 return 0;
2303
2304 mc = kvm_s390_new_mmu_cache();
2305 if (!mc)
2306 return -ENOMEM;
2307 bits = vmalloc(array_size(sizeof(*bits), args->count));
2308 if (!bits)
2309 goto out;
2310
2311 r = copy_from_user(bits, (void __user *)args->values, args->count);
2312 if (r) {
2313 r = -EFAULT;
2314 goto out;
2315 }
2316
2317 do {
2318 r = kvm_s390_mmu_cache_topup(mc);
2319 if (r)
2320 break;
2321 scoped_guard(read_lock, &kvm->mmu_lock) {
2322 r = dat_set_cmma_bits(mc, kvm->arch.gmap->asce, args->start_gfn,
2323 args->count, args->mask, bits);
2324 }
2325 } while (r == -ENOMEM);
2326
2327 set_bit(GMAP_FLAG_USES_CMM, &kvm->arch.gmap->flags);
2328 out:
2329 kvm_s390_free_mmu_cache(mc);
2330 vfree(bits);
2331 return r;
2332 }
2333
2334 /**
2335 * kvm_s390_cpus_from_pv - Convert all protected vCPUs in a protected VM to
2336 * non protected.
2337 * @kvm: the VM whose protected vCPUs are to be converted
2338 * @rc: return value for the RC field of the UVC (in case of error)
2339 * @rrc: return value for the RRC field of the UVC (in case of error)
2340 *
2341 * Does not stop in case of error, tries to convert as many
2342 * CPUs as possible. In case of error, the RC and RRC of the last error are
2343 * returned.
2344 *
2345 * Return: 0 in case of success, otherwise -EIO
2346 */
kvm_s390_cpus_from_pv(struct kvm * kvm,u16 * rc,u16 * rrc)2347 int kvm_s390_cpus_from_pv(struct kvm *kvm, u16 *rc, u16 *rrc)
2348 {
2349 struct kvm_vcpu *vcpu;
2350 unsigned long i;
2351 u16 _rc, _rrc;
2352 int ret = 0;
2353
2354 /*
2355 * We ignore failures and try to destroy as many CPUs as possible.
2356 * At the same time we must not free the assigned resources when
2357 * this fails, as the ultravisor has still access to that memory.
2358 * So kvm_s390_pv_destroy_cpu can leave a "wanted" memory leak
2359 * behind.
2360 * We want to return the first failure rc and rrc, though.
2361 */
2362 kvm_for_each_vcpu(i, vcpu, kvm) {
2363 mutex_lock(&vcpu->mutex);
2364 if (kvm_s390_pv_destroy_cpu(vcpu, &_rc, &_rrc) && !ret) {
2365 *rc = _rc;
2366 *rrc = _rrc;
2367 ret = -EIO;
2368 }
2369 mutex_unlock(&vcpu->mutex);
2370 }
2371 /* Ensure that we re-enable gisa if the non-PV guest used it but the PV guest did not. */
2372 if (use_gisa)
2373 kvm_s390_gisa_enable(kvm);
2374 return ret;
2375 }
2376
2377 /**
2378 * kvm_s390_cpus_to_pv - Convert all non-protected vCPUs in a protected VM
2379 * to protected.
2380 * @kvm: the VM whose protected vCPUs are to be converted
2381 * @rc: return value for the RC field of the UVC (in case of error)
2382 * @rrc: return value for the RRC field of the UVC (in case of error)
2383 *
2384 * Tries to undo the conversion in case of error.
2385 *
2386 * Return: 0 in case of success, otherwise -EIO
2387 */
kvm_s390_cpus_to_pv(struct kvm * kvm,u16 * rc,u16 * rrc)2388 static int kvm_s390_cpus_to_pv(struct kvm *kvm, u16 *rc, u16 *rrc)
2389 {
2390 unsigned long i;
2391 int r = 0;
2392 u16 dummy;
2393
2394 struct kvm_vcpu *vcpu;
2395
2396 /* Disable the GISA if the ultravisor does not support AIV. */
2397 if (!uv_has_feature(BIT_UV_FEAT_AIV))
2398 kvm_s390_gisa_disable(kvm);
2399
2400 kvm_for_each_vcpu(i, vcpu, kvm) {
2401 mutex_lock(&vcpu->mutex);
2402 r = kvm_s390_pv_create_cpu(vcpu, rc, rrc);
2403 mutex_unlock(&vcpu->mutex);
2404 if (r)
2405 break;
2406 }
2407 if (r)
2408 kvm_s390_cpus_from_pv(kvm, &dummy, &dummy);
2409 return r;
2410 }
2411
2412 /*
2413 * Here we provide user space with a direct interface to query UV
2414 * related data like UV maxima and available features as well as
2415 * feature specific data.
2416 *
2417 * To facilitate future extension of the data structures we'll try to
2418 * write data up to the maximum requested length.
2419 */
kvm_s390_handle_pv_info(struct kvm_s390_pv_info * info)2420 static ssize_t kvm_s390_handle_pv_info(struct kvm_s390_pv_info *info)
2421 {
2422 ssize_t len_min;
2423
2424 switch (info->header.id) {
2425 case KVM_PV_INFO_VM: {
2426 len_min = sizeof(info->header) + sizeof(info->vm);
2427
2428 if (info->header.len_max < len_min)
2429 return -EINVAL;
2430
2431 memcpy(info->vm.inst_calls_list,
2432 uv_info.inst_calls_list,
2433 sizeof(uv_info.inst_calls_list));
2434
2435 /* It's max cpuid not max cpus, so it's off by one */
2436 info->vm.max_cpus = uv_info.max_guest_cpu_id + 1;
2437 info->vm.max_guests = uv_info.max_num_sec_conf;
2438 info->vm.max_guest_addr = uv_info.max_sec_stor_addr;
2439 info->vm.feature_indication = uv_info.uv_feature_indications;
2440
2441 return len_min;
2442 }
2443 case KVM_PV_INFO_DUMP: {
2444 len_min = sizeof(info->header) + sizeof(info->dump);
2445
2446 if (info->header.len_max < len_min)
2447 return -EINVAL;
2448
2449 info->dump.dump_cpu_buffer_len = uv_info.guest_cpu_stor_len;
2450 info->dump.dump_config_mem_buffer_per_1m = uv_info.conf_dump_storage_state_len;
2451 info->dump.dump_config_finalize_len = uv_info.conf_dump_finalize_len;
2452 return len_min;
2453 }
2454 default:
2455 return -EINVAL;
2456 }
2457 }
2458
kvm_s390_pv_dmp(struct kvm * kvm,struct kvm_pv_cmd * cmd,struct kvm_s390_pv_dmp dmp)2459 static int kvm_s390_pv_dmp(struct kvm *kvm, struct kvm_pv_cmd *cmd,
2460 struct kvm_s390_pv_dmp dmp)
2461 {
2462 int r = -EINVAL;
2463 void __user *result_buff = (void __user *)dmp.buff_addr;
2464
2465 switch (dmp.subcmd) {
2466 case KVM_PV_DUMP_INIT: {
2467 if (kvm->arch.pv.dumping)
2468 break;
2469
2470 /*
2471 * Block SIE entry as concurrent dump UVCs could lead
2472 * to validities.
2473 */
2474 kvm_s390_vcpu_block_all(kvm);
2475
2476 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
2477 UVC_CMD_DUMP_INIT, &cmd->rc, &cmd->rrc);
2478 KVM_UV_EVENT(kvm, 3, "PROTVIRT DUMP INIT: rc %x rrc %x",
2479 cmd->rc, cmd->rrc);
2480 if (!r) {
2481 kvm->arch.pv.dumping = true;
2482 } else {
2483 kvm_s390_vcpu_unblock_all(kvm);
2484 r = -EINVAL;
2485 }
2486 break;
2487 }
2488 case KVM_PV_DUMP_CONFIG_STOR_STATE: {
2489 if (!kvm->arch.pv.dumping)
2490 break;
2491
2492 /*
2493 * gaddr is an output parameter since we might stop
2494 * early. As dmp will be copied back in our caller, we
2495 * don't need to do it ourselves.
2496 */
2497 r = kvm_s390_pv_dump_stor_state(kvm, result_buff, &dmp.gaddr, dmp.buff_len,
2498 &cmd->rc, &cmd->rrc);
2499 break;
2500 }
2501 case KVM_PV_DUMP_COMPLETE: {
2502 if (!kvm->arch.pv.dumping)
2503 break;
2504
2505 r = -EINVAL;
2506 if (dmp.buff_len < uv_info.conf_dump_finalize_len)
2507 break;
2508
2509 r = kvm_s390_pv_dump_complete(kvm, result_buff,
2510 &cmd->rc, &cmd->rrc);
2511 break;
2512 }
2513 default:
2514 r = -ENOTTY;
2515 break;
2516 }
2517
2518 return r;
2519 }
2520
kvm_s390_handle_pv(struct kvm * kvm,struct kvm_pv_cmd * cmd)2521 static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd)
2522 {
2523 const bool need_lock = (cmd->cmd != KVM_PV_ASYNC_CLEANUP_PERFORM);
2524 void __user *argp = (void __user *)cmd->data;
2525 int r = 0;
2526 u16 dummy;
2527
2528 if (need_lock)
2529 mutex_lock(&kvm->lock);
2530
2531 switch (cmd->cmd) {
2532 case KVM_PV_ENABLE: {
2533 r = -EINVAL;
2534 if (kvm_s390_pv_is_protected(kvm))
2535 break;
2536
2537 mmap_write_lock(kvm->mm);
2538 /*
2539 * Disable creation of new THPs. Existing THPs can stay, they
2540 * will be split when any part of them gets imported.
2541 */
2542 mm_flags_clear(MMF_DISABLE_THP_EXCEPT_ADVISED, kvm->mm);
2543 mm_flags_set(MMF_DISABLE_THP_COMPLETELY, kvm->mm);
2544 set_bit(GMAP_FLAG_EXPORT_ON_UNMAP, &kvm->arch.gmap->flags);
2545 r = gmap_helper_disable_cow_sharing();
2546 mmap_write_unlock(kvm->mm);
2547 if (r)
2548 break;
2549
2550 r = kvm_s390_pv_init_vm(kvm, &cmd->rc, &cmd->rrc);
2551 if (r)
2552 break;
2553
2554 r = kvm_s390_cpus_to_pv(kvm, &cmd->rc, &cmd->rrc);
2555 if (r)
2556 kvm_s390_pv_deinit_vm(kvm, &dummy, &dummy);
2557
2558 /* we need to block service interrupts from now on */
2559 set_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs);
2560 break;
2561 }
2562 case KVM_PV_ASYNC_CLEANUP_PREPARE:
2563 r = -EINVAL;
2564 if (!kvm_s390_pv_is_protected(kvm) || !async_destroy)
2565 break;
2566
2567 r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc);
2568 /*
2569 * If a CPU could not be destroyed, destroy VM will also fail.
2570 * There is no point in trying to destroy it. Instead return
2571 * the rc and rrc from the first CPU that failed destroying.
2572 */
2573 if (r)
2574 break;
2575 r = kvm_s390_pv_set_aside(kvm, &cmd->rc, &cmd->rrc);
2576
2577 /* no need to block service interrupts any more */
2578 clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs);
2579 break;
2580 case KVM_PV_ASYNC_CLEANUP_PERFORM:
2581 r = -EINVAL;
2582 if (!async_destroy)
2583 break;
2584 /* kvm->lock must not be held; this is asserted inside the function. */
2585 r = kvm_s390_pv_deinit_aside_vm(kvm, &cmd->rc, &cmd->rrc);
2586 break;
2587 case KVM_PV_DISABLE: {
2588 r = -EINVAL;
2589 if (!kvm_s390_pv_is_protected(kvm))
2590 break;
2591
2592 r = kvm_s390_cpus_from_pv(kvm, &cmd->rc, &cmd->rrc);
2593 /*
2594 * If a CPU could not be destroyed, destroy VM will also fail.
2595 * There is no point in trying to destroy it. Instead return
2596 * the rc and rrc from the first CPU that failed destroying.
2597 */
2598 if (r)
2599 break;
2600 r = kvm_s390_pv_deinit_cleanup_all(kvm, &cmd->rc, &cmd->rrc);
2601
2602 /* no need to block service interrupts any more */
2603 clear_bit(IRQ_PEND_EXT_SERVICE, &kvm->arch.float_int.masked_irqs);
2604 break;
2605 }
2606 case KVM_PV_SET_SEC_PARMS: {
2607 struct kvm_s390_pv_sec_parm parms = {};
2608 void *hdr;
2609
2610 r = -EINVAL;
2611 if (!kvm_s390_pv_is_protected(kvm))
2612 break;
2613
2614 r = -EFAULT;
2615 if (copy_from_user(&parms, argp, sizeof(parms)))
2616 break;
2617
2618 /* Currently restricted to 1MiB */
2619 r = -EINVAL;
2620 if (parms.length > SZ_1M)
2621 break;
2622
2623 r = -ENOMEM;
2624 hdr = vmalloc(parms.length);
2625 if (!hdr)
2626 break;
2627
2628 r = -EFAULT;
2629 if (!copy_from_user(hdr, (void __user *)parms.origin,
2630 parms.length))
2631 r = kvm_s390_pv_set_sec_parms(kvm, hdr, parms.length,
2632 &cmd->rc, &cmd->rrc);
2633
2634 vfree(hdr);
2635 break;
2636 }
2637 case KVM_PV_UNPACK: {
2638 struct kvm_s390_pv_unp unp = {};
2639
2640 r = -EINVAL;
2641 if (!kvm_s390_pv_is_protected(kvm) || !mm_is_protected(kvm->mm))
2642 break;
2643
2644 r = -EFAULT;
2645 if (copy_from_user(&unp, argp, sizeof(unp)))
2646 break;
2647
2648 r = kvm_s390_pv_unpack(kvm, unp.addr, unp.size, unp.tweak,
2649 &cmd->rc, &cmd->rrc);
2650 break;
2651 }
2652 case KVM_PV_VERIFY: {
2653 r = -EINVAL;
2654 if (!kvm_s390_pv_is_protected(kvm))
2655 break;
2656
2657 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
2658 UVC_CMD_VERIFY_IMG, &cmd->rc, &cmd->rrc);
2659 KVM_UV_EVENT(kvm, 3, "PROTVIRT VERIFY: rc %x rrc %x", cmd->rc,
2660 cmd->rrc);
2661 break;
2662 }
2663 case KVM_PV_PREP_RESET: {
2664 r = -EINVAL;
2665 if (!kvm_s390_pv_is_protected(kvm))
2666 break;
2667
2668 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
2669 UVC_CMD_PREPARE_RESET, &cmd->rc, &cmd->rrc);
2670 KVM_UV_EVENT(kvm, 3, "PROTVIRT PREP RESET: rc %x rrc %x",
2671 cmd->rc, cmd->rrc);
2672 break;
2673 }
2674 case KVM_PV_UNSHARE_ALL: {
2675 r = -EINVAL;
2676 if (!kvm_s390_pv_is_protected(kvm))
2677 break;
2678
2679 r = uv_cmd_nodata(kvm_s390_pv_get_handle(kvm),
2680 UVC_CMD_SET_UNSHARE_ALL, &cmd->rc, &cmd->rrc);
2681 KVM_UV_EVENT(kvm, 3, "PROTVIRT UNSHARE: rc %x rrc %x",
2682 cmd->rc, cmd->rrc);
2683 break;
2684 }
2685 case KVM_PV_INFO: {
2686 struct kvm_s390_pv_info info = {};
2687 ssize_t data_len;
2688
2689 /*
2690 * No need to check the VM protection here.
2691 *
2692 * Maybe user space wants to query some of the data
2693 * when the VM is still unprotected. If we see the
2694 * need to fence a new data command we can still
2695 * return an error in the info handler.
2696 */
2697
2698 r = -EFAULT;
2699 if (copy_from_user(&info, argp, sizeof(info.header)))
2700 break;
2701
2702 r = -EINVAL;
2703 if (info.header.len_max < sizeof(info.header))
2704 break;
2705
2706 data_len = kvm_s390_handle_pv_info(&info);
2707 if (data_len < 0) {
2708 r = data_len;
2709 break;
2710 }
2711 /*
2712 * If a data command struct is extended (multiple
2713 * times) this can be used to determine how much of it
2714 * is valid.
2715 */
2716 info.header.len_written = data_len;
2717
2718 r = -EFAULT;
2719 if (copy_to_user(argp, &info, data_len))
2720 break;
2721
2722 r = 0;
2723 break;
2724 }
2725 case KVM_PV_DUMP: {
2726 struct kvm_s390_pv_dmp dmp;
2727
2728 r = -EINVAL;
2729 if (!kvm_s390_pv_is_protected(kvm))
2730 break;
2731
2732 r = -EFAULT;
2733 if (copy_from_user(&dmp, argp, sizeof(dmp)))
2734 break;
2735
2736 r = kvm_s390_pv_dmp(kvm, cmd, dmp);
2737 if (r)
2738 break;
2739
2740 if (copy_to_user(argp, &dmp, sizeof(dmp))) {
2741 r = -EFAULT;
2742 break;
2743 }
2744
2745 break;
2746 }
2747 default:
2748 r = -ENOTTY;
2749 }
2750 if (need_lock)
2751 mutex_unlock(&kvm->lock);
2752
2753 return r;
2754 }
2755
mem_op_validate_common(struct kvm_s390_mem_op * mop,u64 supported_flags)2756 static int mem_op_validate_common(struct kvm_s390_mem_op *mop, u64 supported_flags)
2757 {
2758 if (mop->flags & ~supported_flags || !mop->size)
2759 return -EINVAL;
2760 if (mop->size > MEM_OP_MAX_SIZE)
2761 return -E2BIG;
2762 if (mop->flags & KVM_S390_MEMOP_F_SKEY_PROTECTION) {
2763 if (mop->key > 0xf)
2764 return -EINVAL;
2765 } else {
2766 mop->key = 0;
2767 }
2768 return 0;
2769 }
2770
kvm_s390_vm_mem_op_abs(struct kvm * kvm,struct kvm_s390_mem_op * mop)2771 static int kvm_s390_vm_mem_op_abs(struct kvm *kvm, struct kvm_s390_mem_op *mop)
2772 {
2773 void __user *uaddr = (void __user *)mop->buf;
2774 void *tmpbuf __free(kvfree) = NULL;
2775 enum gacc_mode acc_mode;
2776 int r;
2777
2778 r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_SKEY_PROTECTION |
2779 KVM_S390_MEMOP_F_CHECK_ONLY);
2780 if (r)
2781 return r;
2782
2783 if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
2784 tmpbuf = vmalloc(mop->size);
2785 if (!tmpbuf)
2786 return -ENOMEM;
2787 }
2788
2789 acc_mode = mop->op == KVM_S390_MEMOP_ABSOLUTE_READ ? GACC_FETCH : GACC_STORE;
2790
2791 scoped_guard(srcu, &kvm->srcu) {
2792 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)
2793 return check_gpa_range(kvm, mop->gaddr, mop->size, acc_mode, mop->key);
2794
2795 if (acc_mode == GACC_STORE && copy_from_user(tmpbuf, uaddr, mop->size))
2796 return -EFAULT;
2797 r = access_guest_abs_with_key(kvm, mop->gaddr, tmpbuf,
2798 mop->size, acc_mode, mop->key);
2799 if (r)
2800 return r;
2801 if (acc_mode != GACC_STORE && copy_to_user(uaddr, tmpbuf, mop->size))
2802 return -EFAULT;
2803 }
2804 return 0;
2805 }
2806
kvm_s390_vm_mem_op_cmpxchg(struct kvm * kvm,struct kvm_s390_mem_op * mop)2807 static int kvm_s390_vm_mem_op_cmpxchg(struct kvm *kvm, struct kvm_s390_mem_op *mop)
2808 {
2809 void __user *uaddr = (void __user *)mop->buf;
2810 void __user *old_addr = (void __user *)mop->old_addr;
2811 union kvm_s390_quad old = { .sixteen = 0 };
2812 union kvm_s390_quad new = { .sixteen = 0 };
2813 bool success = false;
2814 int r;
2815
2816 r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_SKEY_PROTECTION);
2817 if (r)
2818 return r;
2819 /*
2820 * This validates off_in_quad. Checking that size is a power
2821 * of two is not necessary, as cmpxchg_guest_abs_with_key
2822 * takes care of that
2823 */
2824 if (mop->size > sizeof(new))
2825 return -EINVAL;
2826 if (copy_from_user(&new, uaddr, mop->size))
2827 return -EFAULT;
2828 if (copy_from_user(&old, old_addr, mop->size))
2829 return -EFAULT;
2830
2831 scoped_guard(srcu, &kvm->srcu) {
2832 r = cmpxchg_guest_abs_with_key(kvm, mop->gaddr, mop->size, &old, new,
2833 mop->key, &success);
2834
2835 if (!success && copy_to_user(old_addr, &old, mop->size))
2836 return -EFAULT;
2837 }
2838 return r;
2839 }
2840
kvm_s390_vm_mem_op(struct kvm * kvm,struct kvm_s390_mem_op * mop)2841 static int kvm_s390_vm_mem_op(struct kvm *kvm, struct kvm_s390_mem_op *mop)
2842 {
2843 /*
2844 * This is technically a heuristic only, if the kvm->lock is not
2845 * taken, it is not guaranteed that the vm is/remains non-protected.
2846 * This is ok from a kernel perspective, wrongdoing is detected
2847 * on the access, -EFAULT is returned and the vm may crash the
2848 * next time it accesses the memory in question.
2849 * There is no sane usecase to do switching and a memop on two
2850 * different CPUs at the same time.
2851 */
2852 if (kvm_s390_pv_get_handle(kvm))
2853 return -EINVAL;
2854
2855 switch (mop->op) {
2856 case KVM_S390_MEMOP_ABSOLUTE_READ:
2857 case KVM_S390_MEMOP_ABSOLUTE_WRITE:
2858 return kvm_s390_vm_mem_op_abs(kvm, mop);
2859 case KVM_S390_MEMOP_ABSOLUTE_CMPXCHG:
2860 return kvm_s390_vm_mem_op_cmpxchg(kvm, mop);
2861 default:
2862 return -EINVAL;
2863 }
2864 }
2865
kvm_arch_vm_ioctl(struct file * filp,unsigned int ioctl,unsigned long arg)2866 int kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg)
2867 {
2868 struct kvm *kvm = filp->private_data;
2869 void __user *argp = (void __user *)arg;
2870 struct kvm_device_attr attr;
2871 int r;
2872
2873 switch (ioctl) {
2874 case KVM_S390_INTERRUPT: {
2875 struct kvm_s390_interrupt s390int;
2876
2877 r = -EFAULT;
2878 if (copy_from_user(&s390int, argp, sizeof(s390int)))
2879 break;
2880 r = kvm_s390_inject_vm(kvm, &s390int);
2881 break;
2882 }
2883 case KVM_CREATE_IRQCHIP: {
2884 r = -EINVAL;
2885 if (kvm->arch.use_irqchip)
2886 r = 0;
2887 break;
2888 }
2889 case KVM_SET_DEVICE_ATTR: {
2890 r = -EFAULT;
2891 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2892 break;
2893 r = kvm_s390_vm_set_attr(kvm, &attr);
2894 break;
2895 }
2896 case KVM_GET_DEVICE_ATTR: {
2897 r = -EFAULT;
2898 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2899 break;
2900 r = kvm_s390_vm_get_attr(kvm, &attr);
2901 break;
2902 }
2903 case KVM_HAS_DEVICE_ATTR: {
2904 r = -EFAULT;
2905 if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2906 break;
2907 r = kvm_s390_vm_has_attr(kvm, &attr);
2908 break;
2909 }
2910 case KVM_S390_GET_SKEYS: {
2911 struct kvm_s390_skeys args;
2912
2913 r = -EFAULT;
2914 if (copy_from_user(&args, argp,
2915 sizeof(struct kvm_s390_skeys)))
2916 break;
2917 r = kvm_s390_get_skeys(kvm, &args);
2918 break;
2919 }
2920 case KVM_S390_SET_SKEYS: {
2921 struct kvm_s390_skeys args;
2922
2923 r = -EFAULT;
2924 if (copy_from_user(&args, argp,
2925 sizeof(struct kvm_s390_skeys)))
2926 break;
2927 r = kvm_s390_set_skeys(kvm, &args);
2928 break;
2929 }
2930 case KVM_S390_GET_CMMA_BITS: {
2931 struct kvm_s390_cmma_log args;
2932
2933 r = -EFAULT;
2934 if (copy_from_user(&args, argp, sizeof(args)))
2935 break;
2936 mutex_lock(&kvm->slots_lock);
2937 r = kvm_s390_get_cmma_bits(kvm, &args);
2938 mutex_unlock(&kvm->slots_lock);
2939 if (!r) {
2940 r = copy_to_user(argp, &args, sizeof(args));
2941 if (r)
2942 r = -EFAULT;
2943 }
2944 break;
2945 }
2946 case KVM_S390_SET_CMMA_BITS: {
2947 struct kvm_s390_cmma_log args;
2948
2949 r = -EFAULT;
2950 if (copy_from_user(&args, argp, sizeof(args)))
2951 break;
2952 mutex_lock(&kvm->slots_lock);
2953 r = kvm_s390_set_cmma_bits(kvm, &args);
2954 mutex_unlock(&kvm->slots_lock);
2955 break;
2956 }
2957 case KVM_S390_PV_COMMAND: {
2958 struct kvm_pv_cmd args;
2959
2960 /* protvirt means user cpu state */
2961 kvm_s390_set_user_cpu_state_ctrl(kvm);
2962 r = 0;
2963 if (!is_prot_virt_host()) {
2964 r = -EINVAL;
2965 break;
2966 }
2967 if (copy_from_user(&args, argp, sizeof(args))) {
2968 r = -EFAULT;
2969 break;
2970 }
2971 if (args.flags) {
2972 r = -EINVAL;
2973 break;
2974 }
2975 /* must be called without kvm->lock */
2976 r = kvm_s390_handle_pv(kvm, &args);
2977 if (copy_to_user(argp, &args, sizeof(args))) {
2978 r = -EFAULT;
2979 break;
2980 }
2981 break;
2982 }
2983 case KVM_S390_MEM_OP: {
2984 struct kvm_s390_mem_op mem_op;
2985
2986 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
2987 r = kvm_s390_vm_mem_op(kvm, &mem_op);
2988 else
2989 r = -EFAULT;
2990 break;
2991 }
2992 case KVM_S390_KEYOP: {
2993 struct kvm_s390_mmu_cache *mc;
2994 struct kvm_s390_keyop kop;
2995 union skey skey;
2996
2997 if (copy_from_user(&kop, argp, sizeof(kop))) {
2998 r = -EFAULT;
2999 break;
3000 }
3001 skey.skey = kop.key;
3002
3003 mc = kvm_s390_new_mmu_cache();
3004 if (!mc)
3005 return -ENOMEM;
3006
3007 r = kvm_s390_keyop(mc, kvm, kop.operation, kop.guest_addr, skey);
3008 kvm_s390_free_mmu_cache(mc);
3009 if (r < 0)
3010 break;
3011
3012 kop.key = r;
3013 r = 0;
3014 if (copy_to_user(argp, &kop, sizeof(kop)))
3015 r = -EFAULT;
3016 break;
3017 }
3018 case KVM_S390_ZPCI_OP: {
3019 struct kvm_s390_zpci_op args;
3020
3021 r = -EINVAL;
3022 if (!IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))
3023 break;
3024 if (copy_from_user(&args, argp, sizeof(args))) {
3025 r = -EFAULT;
3026 break;
3027 }
3028 r = kvm_s390_pci_zpci_op(kvm, &args);
3029 break;
3030 }
3031 default:
3032 r = -ENOTTY;
3033 }
3034
3035 return r;
3036 }
3037
kvm_s390_apxa_installed(void)3038 static int kvm_s390_apxa_installed(void)
3039 {
3040 struct ap_config_info info;
3041
3042 if (ap_instructions_available()) {
3043 if (ap_qci(&info) == 0)
3044 return info.apxa;
3045 }
3046
3047 return 0;
3048 }
3049
3050 /*
3051 * The format of the crypto control block (CRYCB) is specified in the 3 low
3052 * order bits of the CRYCB designation (CRYCBD) field as follows:
3053 * Format 0: Neither the message security assist extension 3 (MSAX3) nor the
3054 * AP extended addressing (APXA) facility are installed.
3055 * Format 1: The APXA facility is not installed but the MSAX3 facility is.
3056 * Format 2: Both the APXA and MSAX3 facilities are installed
3057 */
kvm_s390_set_crycb_format(struct kvm * kvm)3058 static void kvm_s390_set_crycb_format(struct kvm *kvm)
3059 {
3060 kvm->arch.crypto.crycbd = virt_to_phys(kvm->arch.crypto.crycb);
3061
3062 /* Clear the CRYCB format bits - i.e., set format 0 by default */
3063 kvm->arch.crypto.crycbd &= ~(CRYCB_FORMAT_MASK);
3064
3065 /* Check whether MSAX3 is installed */
3066 if (!test_kvm_facility(kvm, 76))
3067 return;
3068
3069 if (kvm_s390_apxa_installed())
3070 kvm->arch.crypto.crycbd |= CRYCB_FORMAT2;
3071 else
3072 kvm->arch.crypto.crycbd |= CRYCB_FORMAT1;
3073 }
3074
3075 /*
3076 * kvm_arch_crypto_set_masks
3077 *
3078 * @kvm: pointer to the target guest's KVM struct containing the crypto masks
3079 * to be set.
3080 * @apm: the mask identifying the accessible AP adapters
3081 * @aqm: the mask identifying the accessible AP domains
3082 * @adm: the mask identifying the accessible AP control domains
3083 *
3084 * Set the masks that identify the adapters, domains and control domains to
3085 * which the KVM guest is granted access.
3086 *
3087 * Note: The kvm->lock mutex must be locked by the caller before invoking this
3088 * function.
3089 */
kvm_arch_crypto_set_masks(struct kvm * kvm,unsigned long * apm,unsigned long * aqm,unsigned long * adm)3090 void kvm_arch_crypto_set_masks(struct kvm *kvm, unsigned long *apm,
3091 unsigned long *aqm, unsigned long *adm)
3092 {
3093 struct kvm_s390_crypto_cb *crycb = kvm->arch.crypto.crycb;
3094
3095 kvm_s390_vcpu_block_all(kvm);
3096
3097 switch (kvm->arch.crypto.crycbd & CRYCB_FORMAT_MASK) {
3098 case CRYCB_FORMAT2: /* APCB1 use 256 bits */
3099 memcpy(crycb->apcb1.apm, apm, 32);
3100 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx %016lx %016lx %016lx",
3101 apm[0], apm[1], apm[2], apm[3]);
3102 memcpy(crycb->apcb1.aqm, aqm, 32);
3103 VM_EVENT(kvm, 3, "SET CRYCB: aqm %016lx %016lx %016lx %016lx",
3104 aqm[0], aqm[1], aqm[2], aqm[3]);
3105 memcpy(crycb->apcb1.adm, adm, 32);
3106 VM_EVENT(kvm, 3, "SET CRYCB: adm %016lx %016lx %016lx %016lx",
3107 adm[0], adm[1], adm[2], adm[3]);
3108 break;
3109 case CRYCB_FORMAT1:
3110 case CRYCB_FORMAT0: /* Fall through both use APCB0 */
3111 memcpy(crycb->apcb0.apm, apm, 8);
3112 memcpy(crycb->apcb0.aqm, aqm, 2);
3113 memcpy(crycb->apcb0.adm, adm, 2);
3114 VM_EVENT(kvm, 3, "SET CRYCB: apm %016lx aqm %04x adm %04x",
3115 apm[0], *((unsigned short *)aqm),
3116 *((unsigned short *)adm));
3117 break;
3118 default: /* Can not happen */
3119 break;
3120 }
3121
3122 /* recreate the shadow crycb for each vcpu */
3123 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
3124 kvm_s390_vcpu_unblock_all(kvm);
3125 }
3126 EXPORT_SYMBOL_GPL(kvm_arch_crypto_set_masks);
3127
3128 /*
3129 * kvm_arch_crypto_clear_masks
3130 *
3131 * @kvm: pointer to the target guest's KVM struct containing the crypto masks
3132 * to be cleared.
3133 *
3134 * Clear the masks that identify the adapters, domains and control domains to
3135 * which the KVM guest is granted access.
3136 *
3137 * Note: The kvm->lock mutex must be locked by the caller before invoking this
3138 * function.
3139 */
kvm_arch_crypto_clear_masks(struct kvm * kvm)3140 void kvm_arch_crypto_clear_masks(struct kvm *kvm)
3141 {
3142 kvm_s390_vcpu_block_all(kvm);
3143
3144 memset(&kvm->arch.crypto.crycb->apcb0, 0,
3145 sizeof(kvm->arch.crypto.crycb->apcb0));
3146 memset(&kvm->arch.crypto.crycb->apcb1, 0,
3147 sizeof(kvm->arch.crypto.crycb->apcb1));
3148
3149 VM_EVENT(kvm, 3, "%s", "CLR CRYCB:");
3150 /* recreate the shadow crycb for each vcpu */
3151 kvm_s390_sync_request_broadcast(kvm, KVM_REQ_VSIE_RESTART);
3152 kvm_s390_vcpu_unblock_all(kvm);
3153 }
3154 EXPORT_SYMBOL_GPL(kvm_arch_crypto_clear_masks);
3155
kvm_s390_get_initial_cpuid(void)3156 static u64 kvm_s390_get_initial_cpuid(void)
3157 {
3158 struct cpuid cpuid;
3159
3160 get_cpu_id(&cpuid);
3161 cpuid.version = 0xff;
3162 return *((u64 *) &cpuid);
3163 }
3164
kvm_s390_crypto_init(struct kvm * kvm)3165 static void kvm_s390_crypto_init(struct kvm *kvm)
3166 {
3167 kvm->arch.crypto.crycb = &kvm->arch.sie_page2->crycb;
3168 kvm_s390_set_crycb_format(kvm);
3169 init_rwsem(&kvm->arch.crypto.pqap_hook_rwsem);
3170
3171 if (!test_kvm_facility(kvm, 76))
3172 return;
3173
3174 /* Enable AES/DEA protected key functions by default */
3175 kvm->arch.crypto.aes_kw = 1;
3176 kvm->arch.crypto.dea_kw = 1;
3177 get_random_bytes(kvm->arch.crypto.crycb->aes_wrapping_key_mask,
3178 sizeof(kvm->arch.crypto.crycb->aes_wrapping_key_mask));
3179 get_random_bytes(kvm->arch.crypto.crycb->dea_wrapping_key_mask,
3180 sizeof(kvm->arch.crypto.crycb->dea_wrapping_key_mask));
3181 }
3182
sca_dispose(struct kvm * kvm)3183 static void sca_dispose(struct kvm *kvm)
3184 {
3185 free_pages_exact(kvm->arch.sca, sizeof(*kvm->arch.sca));
3186 kvm->arch.sca = NULL;
3187 }
3188
kvm_arch_free_vm(struct kvm * kvm)3189 void kvm_arch_free_vm(struct kvm *kvm)
3190 {
3191 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM))
3192 kvm_s390_pci_clear_list(kvm);
3193
3194 __kvm_arch_free_vm(kvm);
3195 }
3196
kvm_arch_init_vm(struct kvm * kvm,unsigned long type)3197 int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
3198 {
3199 gfp_t alloc_flags = GFP_KERNEL_ACCOUNT | __GFP_ZERO;
3200 char debug_name[16];
3201 int i, rc;
3202
3203 mutex_init(&kvm->arch.pv.import_lock);
3204
3205 rc = -EINVAL;
3206 #ifdef CONFIG_KVM_S390_UCONTROL
3207 if (type & ~KVM_VM_S390_UCONTROL)
3208 goto out_err;
3209 if ((type & KVM_VM_S390_UCONTROL) && (!capable(CAP_SYS_ADMIN)))
3210 goto out_err;
3211 #else
3212 if (type)
3213 goto out_err;
3214 #endif
3215 rc = -ENOMEM;
3216
3217 if (!sclp.has_64bscao)
3218 alloc_flags |= GFP_DMA;
3219 mutex_lock(&kvm_lock);
3220
3221 kvm->arch.sca = alloc_pages_exact(sizeof(*kvm->arch.sca), alloc_flags);
3222 mutex_unlock(&kvm_lock);
3223 if (!kvm->arch.sca)
3224 goto out_err;
3225
3226 snprintf(debug_name, sizeof(debug_name), "kvm-%u", current->pid);
3227
3228 kvm->arch.dbf = debug_register(debug_name, 32, 1, 7 * sizeof(long));
3229 if (!kvm->arch.dbf)
3230 goto out_err;
3231
3232 BUILD_BUG_ON(sizeof(struct sie_page2) != 4096);
3233 kvm->arch.sie_page2 =
3234 (struct sie_page2 *) get_zeroed_page(GFP_KERNEL_ACCOUNT | GFP_DMA);
3235 if (!kvm->arch.sie_page2)
3236 goto out_err;
3237
3238 kvm->arch.sie_page2->kvm = kvm;
3239 kvm->arch.model.fac_list = kvm->arch.sie_page2->fac_list;
3240
3241 for (i = 0; i < kvm_s390_fac_size(); i++) {
3242 kvm->arch.model.fac_mask[i] = stfle_fac_list[i] &
3243 (kvm_s390_fac_base[i] |
3244 kvm_s390_fac_ext[i]);
3245 kvm->arch.model.fac_list[i] = stfle_fac_list[i] &
3246 kvm_s390_fac_base[i];
3247 }
3248 kvm->arch.model.subfuncs = kvm_s390_available_subfunc;
3249
3250 /* we are always in czam mode - even on pre z14 machines */
3251 set_kvm_facility(kvm->arch.model.fac_mask, 138);
3252 set_kvm_facility(kvm->arch.model.fac_list, 138);
3253 /* we emulate STHYI in kvm */
3254 set_kvm_facility(kvm->arch.model.fac_mask, 74);
3255 set_kvm_facility(kvm->arch.model.fac_list, 74);
3256 if (machine_has_tlb_guest()) {
3257 set_kvm_facility(kvm->arch.model.fac_mask, 147);
3258 set_kvm_facility(kvm->arch.model.fac_list, 147);
3259 }
3260
3261 if (css_general_characteristics.aiv && test_facility(65))
3262 set_kvm_facility(kvm->arch.model.fac_mask, 65);
3263
3264 kvm->arch.model.cpuid = kvm_s390_get_initial_cpuid();
3265 kvm->arch.model.ibc = sclp.ibc & 0x0fff;
3266
3267 kvm->arch.model.uv_feat_guest.feat = 0;
3268
3269 kvm_s390_crypto_init(kvm);
3270
3271 if (IS_ENABLED(CONFIG_VFIO_PCI_ZDEV_KVM)) {
3272 mutex_lock(&kvm->lock);
3273 kvm_s390_pci_init_list(kvm);
3274 kvm_s390_vcpu_pci_enable_interp(kvm);
3275 mutex_unlock(&kvm->lock);
3276 }
3277
3278 mutex_init(&kvm->arch.float_int.ais_lock);
3279 spin_lock_init(&kvm->arch.float_int.lock);
3280 for (i = 0; i < FIRQ_LIST_COUNT; i++)
3281 INIT_LIST_HEAD(&kvm->arch.float_int.lists[i]);
3282 init_waitqueue_head(&kvm->arch.ipte_wq);
3283 mutex_init(&kvm->arch.ipte_mutex);
3284
3285 debug_register_view(kvm->arch.dbf, &debug_sprintf_view);
3286 VM_EVENT(kvm, 3, "vm created with type %lu", type);
3287
3288 kvm->arch.mem_limit = type & KVM_VM_S390_UCONTROL ? KVM_S390_NO_MEM_LIMIT : sclp.hamax + 1;
3289 kvm->arch.gmap = gmap_new(kvm, gpa_to_gfn(kvm->arch.mem_limit));
3290 if (!kvm->arch.gmap)
3291 goto out_err;
3292 clear_bit(GMAP_FLAG_PFAULT_ENABLED, &kvm->arch.gmap->flags);
3293
3294 if (type & KVM_VM_S390_UCONTROL) {
3295 struct kvm_userspace_memory_region2 fake_memslot = {
3296 .slot = KVM_S390_UCONTROL_MEMSLOT,
3297 .guest_phys_addr = 0,
3298 .userspace_addr = 0,
3299 .memory_size = ALIGN_DOWN(TASK_SIZE, _SEGMENT_SIZE),
3300 .flags = 0,
3301 };
3302
3303 /* one flat fake memslot covering the whole address-space */
3304 mutex_lock(&kvm->slots_lock);
3305 KVM_BUG_ON(kvm_set_internal_memslot(kvm, &fake_memslot), kvm);
3306 mutex_unlock(&kvm->slots_lock);
3307 set_bit(GMAP_FLAG_IS_UCONTROL, &kvm->arch.gmap->flags);
3308 } else {
3309 struct crst_table *table = dereference_asce(kvm->arch.gmap->asce);
3310
3311 crst_table_init((void *)table, _CRSTE_HOLE(table->crstes[0].h.tt).val);
3312 }
3313
3314 kvm->arch.use_pfmfi = sclp.has_pfmfi;
3315 kvm->arch.use_skf = sclp.has_skey;
3316 spin_lock_init(&kvm->arch.start_stop_lock);
3317 kvm_s390_vsie_init(kvm);
3318 if (use_gisa)
3319 kvm_s390_gisa_init(kvm);
3320 INIT_LIST_HEAD(&kvm->arch.pv.need_cleanup);
3321 kvm->arch.pv.set_aside = NULL;
3322 KVM_EVENT(3, "vm 0x%p created by pid %u", kvm, current->pid);
3323
3324 return 0;
3325 out_err:
3326 free_page((unsigned long)kvm->arch.sie_page2);
3327 debug_unregister(kvm->arch.dbf);
3328 sca_dispose(kvm);
3329 KVM_EVENT(3, "creation of vm failed: %d", rc);
3330 return rc;
3331 }
3332
kvm_arch_vcpu_destroy(struct kvm_vcpu * vcpu)3333 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
3334 {
3335 u16 rc, rrc;
3336
3337 VCPU_EVENT(vcpu, 3, "%s", "free cpu");
3338 trace_kvm_s390_destroy_vcpu(vcpu->vcpu_id);
3339 kvm_s390_clear_local_irqs(vcpu);
3340 kvm_clear_async_pf_completion_queue(vcpu);
3341 if (!kvm_is_ucontrol(vcpu->kvm))
3342 sca_del_vcpu(vcpu);
3343 kvm_s390_update_topology_change_report(vcpu->kvm, 1);
3344
3345 if (kvm_is_ucontrol(vcpu->kvm)) {
3346 scoped_guard(spinlock, &vcpu->kvm->arch.gmap->children_lock)
3347 gmap_remove_child(vcpu->arch.gmap);
3348 vcpu->arch.gmap = gmap_put(vcpu->arch.gmap);
3349 }
3350
3351 if (vcpu->kvm->arch.use_cmma)
3352 kvm_s390_vcpu_unsetup_cmma(vcpu);
3353 /* We can not hold the vcpu mutex here, we are already dying */
3354 if (kvm_s390_pv_cpu_get_handle(vcpu))
3355 kvm_s390_pv_destroy_cpu(vcpu, &rc, &rrc);
3356 free_page((unsigned long)(vcpu->arch.sie_block));
3357 kvm_s390_free_mmu_cache(vcpu->arch.mc);
3358 }
3359
kvm_arch_destroy_vm(struct kvm * kvm)3360 void kvm_arch_destroy_vm(struct kvm *kvm)
3361 {
3362 u16 rc, rrc;
3363
3364 kvm_destroy_vcpus(kvm);
3365 sca_dispose(kvm);
3366 kvm_s390_gisa_destroy(kvm);
3367 /*
3368 * We are already at the end of life and kvm->lock is not taken.
3369 * This is ok as the file descriptor is closed by now and nobody
3370 * can mess with the pv state.
3371 */
3372 kvm_s390_pv_deinit_cleanup_all(kvm, &rc, &rrc);
3373 /*
3374 * Remove the mmu notifier only when the whole KVM VM is torn down,
3375 * and only if one was registered to begin with. If the VM is
3376 * currently not protected, but has been previously been protected,
3377 * then it's possible that the notifier is still registered.
3378 */
3379 if (kvm->arch.pv.mmu_notifier.ops)
3380 mmu_notifier_unregister(&kvm->arch.pv.mmu_notifier, kvm->mm);
3381
3382 debug_unregister(kvm->arch.dbf);
3383 free_page((unsigned long)kvm->arch.sie_page2);
3384 kvm_s390_destroy_adapters(kvm);
3385 kvm_s390_clear_float_irqs(kvm);
3386 kvm_s390_vsie_destroy(kvm);
3387 kvm->arch.gmap = gmap_put(kvm->arch.gmap);
3388 KVM_EVENT(3, "vm 0x%p destroyed", kvm);
3389 }
3390
3391 /* Section: vcpu related */
sca_del_vcpu(struct kvm_vcpu * vcpu)3392 static void sca_del_vcpu(struct kvm_vcpu *vcpu)
3393 {
3394 struct esca_block *sca = vcpu->kvm->arch.sca;
3395
3396 if (!kvm_s390_use_sca_entries())
3397 return;
3398
3399 clear_bit_inv(vcpu->vcpu_id, (unsigned long *)sca->mcn);
3400 sca->cpu[vcpu->vcpu_id].sda = 0;
3401 }
3402
sca_add_vcpu(struct kvm_vcpu * vcpu)3403 static void sca_add_vcpu(struct kvm_vcpu *vcpu)
3404 {
3405 struct esca_block *sca = vcpu->kvm->arch.sca;
3406 phys_addr_t sca_phys = virt_to_phys(sca);
3407
3408 /* we still need the sca header for the ipte control */
3409 vcpu->arch.sie_block->scaoh = sca_phys >> 32;
3410 vcpu->arch.sie_block->scaol = sca_phys & ESCA_SCAOL_MASK;
3411 vcpu->arch.sie_block->ecb2 |= ECB2_ESCA;
3412
3413 if (!kvm_s390_use_sca_entries())
3414 return;
3415
3416 set_bit_inv(vcpu->vcpu_id, (unsigned long *)sca->mcn);
3417 sca->cpu[vcpu->vcpu_id].sda = virt_to_phys(vcpu->arch.sie_block);
3418 }
3419
sca_can_add_vcpu(struct kvm * kvm,unsigned int id)3420 static int sca_can_add_vcpu(struct kvm *kvm, unsigned int id)
3421 {
3422 if (!kvm_s390_use_sca_entries())
3423 return id < KVM_MAX_VCPUS;
3424
3425 return id < KVM_S390_ESCA_CPU_SLOTS;
3426 }
3427
3428 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
__start_cpu_timer_accounting(struct kvm_vcpu * vcpu)3429 static void __start_cpu_timer_accounting(struct kvm_vcpu *vcpu)
3430 {
3431 WARN_ON_ONCE(vcpu->arch.cputm_start != 0);
3432 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
3433 vcpu->arch.cputm_start = get_tod_clock_fast();
3434 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
3435 }
3436
3437 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
__stop_cpu_timer_accounting(struct kvm_vcpu * vcpu)3438 static void __stop_cpu_timer_accounting(struct kvm_vcpu *vcpu)
3439 {
3440 WARN_ON_ONCE(vcpu->arch.cputm_start == 0);
3441 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
3442 vcpu->arch.sie_block->cputm -= get_tod_clock_fast() - vcpu->arch.cputm_start;
3443 vcpu->arch.cputm_start = 0;
3444 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
3445 }
3446
3447 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
__enable_cpu_timer_accounting(struct kvm_vcpu * vcpu)3448 static void __enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
3449 {
3450 WARN_ON_ONCE(vcpu->arch.cputm_enabled);
3451 vcpu->arch.cputm_enabled = true;
3452 __start_cpu_timer_accounting(vcpu);
3453 }
3454
3455 /* needs disabled preemption to protect from TOD sync and vcpu_load/put */
__disable_cpu_timer_accounting(struct kvm_vcpu * vcpu)3456 static void __disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
3457 {
3458 WARN_ON_ONCE(!vcpu->arch.cputm_enabled);
3459 __stop_cpu_timer_accounting(vcpu);
3460 vcpu->arch.cputm_enabled = false;
3461 }
3462
enable_cpu_timer_accounting(struct kvm_vcpu * vcpu)3463 static void enable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
3464 {
3465 preempt_disable(); /* protect from TOD sync and vcpu_load/put */
3466 __enable_cpu_timer_accounting(vcpu);
3467 preempt_enable();
3468 }
3469
disable_cpu_timer_accounting(struct kvm_vcpu * vcpu)3470 static void disable_cpu_timer_accounting(struct kvm_vcpu *vcpu)
3471 {
3472 preempt_disable(); /* protect from TOD sync and vcpu_load/put */
3473 __disable_cpu_timer_accounting(vcpu);
3474 preempt_enable();
3475 }
3476
3477 /* set the cpu timer - may only be called from the VCPU thread itself */
kvm_s390_set_cpu_timer(struct kvm_vcpu * vcpu,__u64 cputm)3478 void kvm_s390_set_cpu_timer(struct kvm_vcpu *vcpu, __u64 cputm)
3479 {
3480 preempt_disable(); /* protect from TOD sync and vcpu_load/put */
3481 raw_write_seqcount_begin(&vcpu->arch.cputm_seqcount);
3482 if (vcpu->arch.cputm_enabled)
3483 vcpu->arch.cputm_start = get_tod_clock_fast();
3484 vcpu->arch.sie_block->cputm = cputm;
3485 raw_write_seqcount_end(&vcpu->arch.cputm_seqcount);
3486 preempt_enable();
3487 }
3488
3489 /* update and get the cpu timer - can also be called from other VCPU threads */
kvm_s390_get_cpu_timer(struct kvm_vcpu * vcpu)3490 __u64 kvm_s390_get_cpu_timer(struct kvm_vcpu *vcpu)
3491 {
3492 unsigned int seq;
3493 __u64 value;
3494
3495 if (unlikely(!vcpu->arch.cputm_enabled))
3496 return vcpu->arch.sie_block->cputm;
3497
3498 preempt_disable(); /* protect from TOD sync and vcpu_load/put */
3499 do {
3500 seq = raw_read_seqcount(&vcpu->arch.cputm_seqcount);
3501 /*
3502 * If the writer would ever execute a read in the critical
3503 * section, e.g. in irq context, we have a deadlock.
3504 */
3505 WARN_ON_ONCE((seq & 1) && smp_processor_id() == vcpu->cpu);
3506 value = vcpu->arch.sie_block->cputm;
3507 /* if cputm_start is 0, accounting is being started/stopped */
3508 if (likely(vcpu->arch.cputm_start))
3509 value -= get_tod_clock_fast() - vcpu->arch.cputm_start;
3510 } while (read_seqcount_retry(&vcpu->arch.cputm_seqcount, seq & ~1));
3511 preempt_enable();
3512 return value;
3513 }
3514
kvm_arch_vcpu_load(struct kvm_vcpu * vcpu,int cpu)3515 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
3516 {
3517
3518 kvm_s390_set_cpuflags(vcpu, CPUSTAT_RUNNING);
3519 if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
3520 __start_cpu_timer_accounting(vcpu);
3521 vcpu->cpu = cpu;
3522 }
3523
kvm_arch_vcpu_put(struct kvm_vcpu * vcpu)3524 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
3525 {
3526 vcpu->cpu = -1;
3527 if (vcpu->arch.cputm_enabled && !is_vcpu_idle(vcpu))
3528 __stop_cpu_timer_accounting(vcpu);
3529 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_RUNNING);
3530
3531 }
3532
kvm_arch_vcpu_postcreate(struct kvm_vcpu * vcpu)3533 void kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
3534 {
3535 mutex_lock(&vcpu->kvm->lock);
3536 preempt_disable();
3537 vcpu->arch.sie_block->epoch = vcpu->kvm->arch.epoch;
3538 vcpu->arch.sie_block->epdx = vcpu->kvm->arch.epdx;
3539 preempt_enable();
3540 mutex_unlock(&vcpu->kvm->lock);
3541 if (!kvm_is_ucontrol(vcpu->kvm)) {
3542 vcpu->arch.gmap = vcpu->kvm->arch.gmap;
3543 sca_add_vcpu(vcpu);
3544 }
3545 if (test_kvm_facility(vcpu->kvm, 74) || vcpu->kvm->arch.user_instr0)
3546 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
3547 }
3548
kvm_has_pckmo_subfunc(struct kvm * kvm,unsigned long nr)3549 static bool kvm_has_pckmo_subfunc(struct kvm *kvm, unsigned long nr)
3550 {
3551 if (test_bit_inv(nr, (unsigned long *)&kvm->arch.model.subfuncs.pckmo) &&
3552 test_bit_inv(nr, (unsigned long *)&kvm_s390_available_subfunc.pckmo))
3553 return true;
3554 return false;
3555 }
3556
kvm_has_pckmo_ecc(struct kvm * kvm)3557 static bool kvm_has_pckmo_ecc(struct kvm *kvm)
3558 {
3559 /* At least one ECC subfunction must be present */
3560 return kvm_has_pckmo_subfunc(kvm, 32) ||
3561 kvm_has_pckmo_subfunc(kvm, 33) ||
3562 kvm_has_pckmo_subfunc(kvm, 34) ||
3563 kvm_has_pckmo_subfunc(kvm, 40) ||
3564 kvm_has_pckmo_subfunc(kvm, 41);
3565
3566 }
3567
kvm_has_pckmo_hmac(struct kvm * kvm)3568 static bool kvm_has_pckmo_hmac(struct kvm *kvm)
3569 {
3570 /* At least one HMAC subfunction must be present */
3571 return kvm_has_pckmo_subfunc(kvm, 118) ||
3572 kvm_has_pckmo_subfunc(kvm, 122);
3573 }
3574
kvm_s390_vcpu_crypto_setup(struct kvm_vcpu * vcpu)3575 static void kvm_s390_vcpu_crypto_setup(struct kvm_vcpu *vcpu)
3576 {
3577 /*
3578 * If the AP instructions are not being interpreted and the MSAX3
3579 * facility is not configured for the guest, there is nothing to set up.
3580 */
3581 if (!vcpu->kvm->arch.crypto.apie && !test_kvm_facility(vcpu->kvm, 76))
3582 return;
3583
3584 vcpu->arch.sie_block->crycbd = vcpu->kvm->arch.crypto.crycbd;
3585 vcpu->arch.sie_block->ecb3 &= ~(ECB3_AES | ECB3_DEA);
3586 vcpu->arch.sie_block->eca &= ~ECA_APIE;
3587 vcpu->arch.sie_block->ecd &= ~(ECD_ECC | ECD_HMAC);
3588
3589 if (vcpu->kvm->arch.crypto.apie)
3590 vcpu->arch.sie_block->eca |= ECA_APIE;
3591
3592 /* Set up protected key support */
3593 if (vcpu->kvm->arch.crypto.aes_kw) {
3594 vcpu->arch.sie_block->ecb3 |= ECB3_AES;
3595 /* ecc/hmac is also wrapped with AES key */
3596 if (kvm_has_pckmo_ecc(vcpu->kvm))
3597 vcpu->arch.sie_block->ecd |= ECD_ECC;
3598 if (kvm_has_pckmo_hmac(vcpu->kvm))
3599 vcpu->arch.sie_block->ecd |= ECD_HMAC;
3600 }
3601
3602 if (vcpu->kvm->arch.crypto.dea_kw)
3603 vcpu->arch.sie_block->ecb3 |= ECB3_DEA;
3604 }
3605
kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu * vcpu)3606 void kvm_s390_vcpu_unsetup_cmma(struct kvm_vcpu *vcpu)
3607 {
3608 free_page((unsigned long)phys_to_virt(vcpu->arch.sie_block->cbrlo));
3609 vcpu->arch.sie_block->cbrlo = 0;
3610 }
3611
kvm_s390_vcpu_setup_cmma(struct kvm_vcpu * vcpu)3612 int kvm_s390_vcpu_setup_cmma(struct kvm_vcpu *vcpu)
3613 {
3614 void *cbrlo_page = (void *)get_zeroed_page(GFP_KERNEL_ACCOUNT);
3615
3616 if (!cbrlo_page)
3617 return -ENOMEM;
3618
3619 vcpu->arch.sie_block->cbrlo = virt_to_phys(cbrlo_page);
3620 return 0;
3621 }
3622
kvm_s390_vcpu_setup_model(struct kvm_vcpu * vcpu)3623 static void kvm_s390_vcpu_setup_model(struct kvm_vcpu *vcpu)
3624 {
3625 struct kvm_s390_cpu_model *model = &vcpu->kvm->arch.model;
3626
3627 vcpu->arch.sie_block->ibc = model->ibc;
3628 if (test_kvm_facility(vcpu->kvm, 7))
3629 vcpu->arch.sie_block->fac = virt_to_phys(model->fac_list);
3630 }
3631
kvm_s390_vcpu_setup(struct kvm_vcpu * vcpu)3632 static int kvm_s390_vcpu_setup(struct kvm_vcpu *vcpu)
3633 {
3634 int rc = 0;
3635 u16 uvrc, uvrrc;
3636
3637 atomic_set(&vcpu->arch.sie_block->cpuflags, CPUSTAT_ZARCH |
3638 CPUSTAT_SM |
3639 CPUSTAT_STOPPED);
3640
3641 if (test_kvm_facility(vcpu->kvm, 78))
3642 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED2);
3643 else if (test_kvm_facility(vcpu->kvm, 8))
3644 kvm_s390_set_cpuflags(vcpu, CPUSTAT_GED);
3645
3646 kvm_s390_vcpu_setup_model(vcpu);
3647
3648 /* pgste_set_pte has special handling for !machine_has_esop() */
3649 if (machine_has_esop())
3650 vcpu->arch.sie_block->ecb |= ECB_HOSTPROTINT;
3651 if (test_kvm_facility(vcpu->kvm, 9))
3652 vcpu->arch.sie_block->ecb |= ECB_SRSI;
3653 if (test_kvm_facility(vcpu->kvm, 11))
3654 vcpu->arch.sie_block->ecb |= ECB_PTF;
3655 if (test_kvm_facility(vcpu->kvm, 73))
3656 vcpu->arch.sie_block->ecb |= ECB_TE;
3657 if (!kvm_is_ucontrol(vcpu->kvm))
3658 vcpu->arch.sie_block->ecb |= ECB_SPECI;
3659
3660 if (test_kvm_facility(vcpu->kvm, 8) && vcpu->kvm->arch.use_pfmfi)
3661 vcpu->arch.sie_block->ecb2 |= ECB2_PFMFI;
3662 if (test_kvm_facility(vcpu->kvm, 130))
3663 vcpu->arch.sie_block->ecb2 |= ECB2_IEP;
3664 vcpu->arch.sie_block->eca = ECA_MVPGI | ECA_PROTEXCI;
3665 if (sclp.has_cei)
3666 vcpu->arch.sie_block->eca |= ECA_CEI;
3667 if (sclp.has_ib)
3668 vcpu->arch.sie_block->eca |= ECA_IB;
3669 if (sclp.has_siif)
3670 vcpu->arch.sie_block->eca |= ECA_SII;
3671 if (kvm_s390_use_sca_entries())
3672 vcpu->arch.sie_block->eca |= ECA_SIGPI;
3673 if (test_kvm_facility(vcpu->kvm, 129)) {
3674 vcpu->arch.sie_block->eca |= ECA_VX;
3675 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
3676 }
3677 if (test_kvm_facility(vcpu->kvm, 139))
3678 vcpu->arch.sie_block->ecd |= ECD_MEF;
3679 if (test_kvm_facility(vcpu->kvm, 156))
3680 vcpu->arch.sie_block->ecd |= ECD_ETOKENF;
3681 if (vcpu->arch.sie_block->gd) {
3682 vcpu->arch.sie_block->eca |= ECA_AIV;
3683 VCPU_EVENT(vcpu, 3, "AIV gisa format-%u enabled for cpu %03u",
3684 vcpu->arch.sie_block->gd & 0x3, vcpu->vcpu_id);
3685 }
3686 vcpu->arch.sie_block->sdnxo = virt_to_phys(&vcpu->run->s.regs.sdnx) | SDNXC;
3687 vcpu->arch.sie_block->riccbd = virt_to_phys(&vcpu->run->s.regs.riccb);
3688
3689 if (sclp.has_kss)
3690 kvm_s390_set_cpuflags(vcpu, CPUSTAT_KSS);
3691 else
3692 vcpu->arch.sie_block->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
3693
3694 if (vcpu->kvm->arch.use_cmma) {
3695 rc = kvm_s390_vcpu_setup_cmma(vcpu);
3696 if (rc)
3697 return rc;
3698 }
3699 hrtimer_setup(&vcpu->arch.ckc_timer, kvm_s390_idle_wakeup, CLOCK_MONOTONIC,
3700 HRTIMER_MODE_REL);
3701
3702 vcpu->arch.sie_block->hpid = HPID_KVM;
3703
3704 kvm_s390_vcpu_crypto_setup(vcpu);
3705
3706 kvm_s390_vcpu_pci_setup(vcpu);
3707
3708 mutex_lock(&vcpu->kvm->lock);
3709 if (kvm_s390_pv_is_protected(vcpu->kvm)) {
3710 rc = kvm_s390_pv_create_cpu(vcpu, &uvrc, &uvrrc);
3711 if (rc)
3712 kvm_s390_vcpu_unsetup_cmma(vcpu);
3713 }
3714 mutex_unlock(&vcpu->kvm->lock);
3715
3716 return rc;
3717 }
3718
kvm_arch_vcpu_precreate(struct kvm * kvm,unsigned int id)3719 int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
3720 {
3721 if (!kvm_is_ucontrol(kvm) && !sca_can_add_vcpu(kvm, id))
3722 return -EINVAL;
3723 return 0;
3724 }
3725
kvm_arch_vcpu_create(struct kvm_vcpu * vcpu)3726 int kvm_arch_vcpu_create(struct kvm_vcpu *vcpu)
3727 {
3728 struct sie_page *sie_page;
3729 int rc;
3730
3731 BUILD_BUG_ON(sizeof(struct sie_page) != 4096);
3732 vcpu->arch.mc = kvm_s390_new_mmu_cache();
3733 if (!vcpu->arch.mc)
3734 return -ENOMEM;
3735 sie_page = (struct sie_page *) get_zeroed_page(GFP_KERNEL_ACCOUNT);
3736 if (!sie_page) {
3737 kvm_s390_free_mmu_cache(vcpu->arch.mc);
3738 vcpu->arch.mc = NULL;
3739 return -ENOMEM;
3740 }
3741
3742 vcpu->arch.sie_block = &sie_page->sie_block;
3743 vcpu->arch.sie_block->itdba = virt_to_phys(&sie_page->itdb);
3744
3745 /* the real guest size will always be smaller than msl */
3746 vcpu->arch.sie_block->mso = 0;
3747 vcpu->arch.sie_block->msl = sclp.hamax;
3748
3749 vcpu->arch.sie_block->icpua = vcpu->vcpu_id;
3750 spin_lock_init(&vcpu->arch.local_int.lock);
3751 vcpu->arch.sie_block->gd = kvm_s390_get_gisa_desc(vcpu->kvm);
3752 seqcount_init(&vcpu->arch.cputm_seqcount);
3753
3754 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
3755 kvm_clear_async_pf_completion_queue(vcpu);
3756 vcpu->run->kvm_valid_regs = KVM_SYNC_PREFIX |
3757 KVM_SYNC_GPRS |
3758 KVM_SYNC_ACRS |
3759 KVM_SYNC_CRS |
3760 KVM_SYNC_ARCH0 |
3761 KVM_SYNC_PFAULT |
3762 KVM_SYNC_DIAG318;
3763 vcpu->arch.acrs_loaded = false;
3764 kvm_s390_set_prefix(vcpu, 0);
3765 if (test_kvm_facility(vcpu->kvm, 64))
3766 vcpu->run->kvm_valid_regs |= KVM_SYNC_RICCB;
3767 if (test_kvm_facility(vcpu->kvm, 82))
3768 vcpu->run->kvm_valid_regs |= KVM_SYNC_BPBC;
3769 if (test_kvm_facility(vcpu->kvm, 133))
3770 vcpu->run->kvm_valid_regs |= KVM_SYNC_GSCB;
3771 if (test_kvm_facility(vcpu->kvm, 156))
3772 vcpu->run->kvm_valid_regs |= KVM_SYNC_ETOKEN;
3773 /* fprs can be synchronized via vrs, even if the guest has no vx. With
3774 * cpu_has_vx(), (load|store)_fpu_regs() will work with vrs format.
3775 */
3776 if (cpu_has_vx())
3777 vcpu->run->kvm_valid_regs |= KVM_SYNC_VRS;
3778 else
3779 vcpu->run->kvm_valid_regs |= KVM_SYNC_FPRS;
3780
3781 if (kvm_is_ucontrol(vcpu->kvm)) {
3782 rc = -ENOMEM;
3783 vcpu->arch.gmap = gmap_new_child(vcpu->kvm->arch.gmap, -1UL);
3784 if (!vcpu->arch.gmap)
3785 goto out_free_sie_block;
3786 }
3787
3788 VM_EVENT(vcpu->kvm, 3, "create cpu %d at 0x%p, sie block at 0x%p",
3789 vcpu->vcpu_id, vcpu, vcpu->arch.sie_block);
3790 trace_kvm_s390_create_vcpu(vcpu->vcpu_id, vcpu, vcpu->arch.sie_block);
3791
3792 rc = kvm_s390_vcpu_setup(vcpu);
3793 if (rc)
3794 goto out_ucontrol_uninit;
3795
3796 kvm_s390_update_topology_change_report(vcpu->kvm, 1);
3797 return 0;
3798
3799 out_ucontrol_uninit:
3800 if (kvm_is_ucontrol(vcpu->kvm)) {
3801 gmap_remove_child(vcpu->arch.gmap);
3802 vcpu->arch.gmap = gmap_put(vcpu->arch.gmap);
3803 }
3804 out_free_sie_block:
3805 free_page((unsigned long)(vcpu->arch.sie_block));
3806 return rc;
3807 }
3808
kvm_arch_vcpu_runnable(struct kvm_vcpu * vcpu)3809 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
3810 {
3811 clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask);
3812 return kvm_s390_vcpu_has_irq(vcpu, 0);
3813 }
3814
kvm_arch_vcpu_in_kernel(struct kvm_vcpu * vcpu)3815 bool kvm_arch_vcpu_in_kernel(struct kvm_vcpu *vcpu)
3816 {
3817 return !(vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE);
3818 }
3819
kvm_s390_vcpu_block(struct kvm_vcpu * vcpu)3820 void kvm_s390_vcpu_block(struct kvm_vcpu *vcpu)
3821 {
3822 atomic_or(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
3823 exit_sie(vcpu);
3824 }
3825
kvm_s390_vcpu_unblock(struct kvm_vcpu * vcpu)3826 void kvm_s390_vcpu_unblock(struct kvm_vcpu *vcpu)
3827 {
3828 atomic_andnot(PROG_BLOCK_SIE, &vcpu->arch.sie_block->prog20);
3829 }
3830
kvm_s390_vcpu_request(struct kvm_vcpu * vcpu)3831 static void kvm_s390_vcpu_request(struct kvm_vcpu *vcpu)
3832 {
3833 atomic_or(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
3834 exit_sie(vcpu);
3835 }
3836
kvm_s390_vcpu_sie_inhibited(struct kvm_vcpu * vcpu)3837 bool kvm_s390_vcpu_sie_inhibited(struct kvm_vcpu *vcpu)
3838 {
3839 return atomic_read(&vcpu->arch.sie_block->prog20) &
3840 (PROG_BLOCK_SIE | PROG_REQUEST);
3841 }
3842
kvm_s390_vcpu_request_handled(struct kvm_vcpu * vcpu)3843 static void kvm_s390_vcpu_request_handled(struct kvm_vcpu *vcpu)
3844 {
3845 atomic_andnot(PROG_REQUEST, &vcpu->arch.sie_block->prog20);
3846 }
3847
3848 /*
3849 * Kick a guest cpu out of (v)SIE and wait until (v)SIE is not running.
3850 * If the CPU is not running (e.g. waiting as idle) the function will
3851 * return immediately. */
exit_sie(struct kvm_vcpu * vcpu)3852 void exit_sie(struct kvm_vcpu *vcpu)
3853 {
3854 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOP_INT);
3855 kvm_s390_vsie_kick(vcpu);
3856 while (vcpu->arch.sie_block->prog0c & PROG_IN_SIE)
3857 cpu_relax();
3858 }
3859
3860 /* Kick a guest cpu out of SIE to process a request synchronously */
kvm_s390_sync_request(int req,struct kvm_vcpu * vcpu)3861 void kvm_s390_sync_request(int req, struct kvm_vcpu *vcpu)
3862 {
3863 __kvm_make_request(req, vcpu);
3864 kvm_s390_vcpu_request(vcpu);
3865 }
3866
kvm_arch_no_poll(struct kvm_vcpu * vcpu)3867 bool kvm_arch_no_poll(struct kvm_vcpu *vcpu)
3868 {
3869 /* do not poll with more than halt_poll_max_steal percent of steal time */
3870 if (get_lowcore()->avg_steal_timer * 100 / (TICK_USEC << 12) >=
3871 READ_ONCE(halt_poll_max_steal)) {
3872 vcpu->stat.halt_no_poll_steal++;
3873 return true;
3874 }
3875 return false;
3876 }
3877
kvm_arch_vcpu_should_kick(struct kvm_vcpu * vcpu)3878 int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
3879 {
3880 /* kvm common code refers to this, but never calls it */
3881 BUG();
3882 return 0;
3883 }
3884
kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu * vcpu,struct kvm_one_reg * reg)3885 static int kvm_arch_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu,
3886 struct kvm_one_reg *reg)
3887 {
3888 int r = -EINVAL;
3889
3890 switch (reg->id) {
3891 case KVM_REG_S390_TODPR:
3892 r = put_user(vcpu->arch.sie_block->todpr,
3893 (u32 __user *)reg->addr);
3894 break;
3895 case KVM_REG_S390_EPOCHDIFF:
3896 r = put_user(vcpu->arch.sie_block->epoch,
3897 (u64 __user *)reg->addr);
3898 break;
3899 case KVM_REG_S390_CPU_TIMER:
3900 r = put_user(kvm_s390_get_cpu_timer(vcpu),
3901 (u64 __user *)reg->addr);
3902 break;
3903 case KVM_REG_S390_CLOCK_COMP:
3904 r = put_user(vcpu->arch.sie_block->ckc,
3905 (u64 __user *)reg->addr);
3906 break;
3907 case KVM_REG_S390_PFTOKEN:
3908 r = put_user(vcpu->arch.pfault_token,
3909 (u64 __user *)reg->addr);
3910 break;
3911 case KVM_REG_S390_PFCOMPARE:
3912 r = put_user(vcpu->arch.pfault_compare,
3913 (u64 __user *)reg->addr);
3914 break;
3915 case KVM_REG_S390_PFSELECT:
3916 r = put_user(vcpu->arch.pfault_select,
3917 (u64 __user *)reg->addr);
3918 break;
3919 case KVM_REG_S390_PP:
3920 r = put_user(vcpu->arch.sie_block->pp,
3921 (u64 __user *)reg->addr);
3922 break;
3923 case KVM_REG_S390_GBEA:
3924 r = put_user(vcpu->arch.sie_block->gbea,
3925 (u64 __user *)reg->addr);
3926 break;
3927 default:
3928 break;
3929 }
3930
3931 return r;
3932 }
3933
kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu * vcpu,struct kvm_one_reg * reg)3934 static int kvm_arch_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu,
3935 struct kvm_one_reg *reg)
3936 {
3937 int r = -EINVAL;
3938 __u64 val;
3939
3940 switch (reg->id) {
3941 case KVM_REG_S390_TODPR:
3942 r = get_user(vcpu->arch.sie_block->todpr,
3943 (u32 __user *)reg->addr);
3944 break;
3945 case KVM_REG_S390_EPOCHDIFF:
3946 r = get_user(vcpu->arch.sie_block->epoch,
3947 (u64 __user *)reg->addr);
3948 break;
3949 case KVM_REG_S390_CPU_TIMER:
3950 r = get_user(val, (u64 __user *)reg->addr);
3951 if (!r)
3952 kvm_s390_set_cpu_timer(vcpu, val);
3953 break;
3954 case KVM_REG_S390_CLOCK_COMP:
3955 r = get_user(vcpu->arch.sie_block->ckc,
3956 (u64 __user *)reg->addr);
3957 break;
3958 case KVM_REG_S390_PFTOKEN:
3959 r = get_user(vcpu->arch.pfault_token,
3960 (u64 __user *)reg->addr);
3961 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
3962 kvm_clear_async_pf_completion_queue(vcpu);
3963 break;
3964 case KVM_REG_S390_PFCOMPARE:
3965 r = get_user(vcpu->arch.pfault_compare,
3966 (u64 __user *)reg->addr);
3967 break;
3968 case KVM_REG_S390_PFSELECT:
3969 r = get_user(vcpu->arch.pfault_select,
3970 (u64 __user *)reg->addr);
3971 break;
3972 case KVM_REG_S390_PP:
3973 r = get_user(vcpu->arch.sie_block->pp,
3974 (u64 __user *)reg->addr);
3975 break;
3976 case KVM_REG_S390_GBEA:
3977 r = get_user(vcpu->arch.sie_block->gbea,
3978 (u64 __user *)reg->addr);
3979 break;
3980 default:
3981 break;
3982 }
3983
3984 return r;
3985 }
3986
kvm_arch_vcpu_ioctl_normal_reset(struct kvm_vcpu * vcpu)3987 static void kvm_arch_vcpu_ioctl_normal_reset(struct kvm_vcpu *vcpu)
3988 {
3989 vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_RI;
3990 vcpu->arch.pfault_token = KVM_S390_PFAULT_TOKEN_INVALID;
3991 memset(vcpu->run->s.regs.riccb, 0, sizeof(vcpu->run->s.regs.riccb));
3992
3993 kvm_clear_async_pf_completion_queue(vcpu);
3994 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm))
3995 kvm_s390_vcpu_stop(vcpu);
3996 kvm_s390_clear_local_irqs(vcpu);
3997 }
3998
kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu * vcpu)3999 static void kvm_arch_vcpu_ioctl_initial_reset(struct kvm_vcpu *vcpu)
4000 {
4001 /* Initial reset is a superset of the normal reset */
4002 kvm_arch_vcpu_ioctl_normal_reset(vcpu);
4003
4004 /*
4005 * This equals initial cpu reset in pop, but we don't switch to ESA.
4006 * We do not only reset the internal data, but also ...
4007 */
4008 vcpu->arch.sie_block->gpsw.mask = 0;
4009 vcpu->arch.sie_block->gpsw.addr = 0;
4010 kvm_s390_set_prefix(vcpu, 0);
4011 kvm_s390_set_cpu_timer(vcpu, 0);
4012 vcpu->arch.sie_block->ckc = 0;
4013 memset(vcpu->arch.sie_block->gcr, 0, sizeof(vcpu->arch.sie_block->gcr));
4014 vcpu->arch.sie_block->gcr[0] = CR0_INITIAL_MASK;
4015 vcpu->arch.sie_block->gcr[14] = CR14_INITIAL_MASK;
4016
4017 /* ... the data in sync regs */
4018 memset(vcpu->run->s.regs.crs, 0, sizeof(vcpu->run->s.regs.crs));
4019 vcpu->run->s.regs.ckc = 0;
4020 vcpu->run->s.regs.crs[0] = CR0_INITIAL_MASK;
4021 vcpu->run->s.regs.crs[14] = CR14_INITIAL_MASK;
4022 vcpu->run->psw_addr = 0;
4023 vcpu->run->psw_mask = 0;
4024 vcpu->run->s.regs.todpr = 0;
4025 vcpu->run->s.regs.cputm = 0;
4026 vcpu->run->s.regs.ckc = 0;
4027 vcpu->run->s.regs.pp = 0;
4028 vcpu->run->s.regs.gbea = 1;
4029 vcpu->run->s.regs.fpc = 0;
4030 /*
4031 * Do not reset these registers in the protected case, as some of
4032 * them are overlaid and they are not accessible in this case
4033 * anyway.
4034 */
4035 if (!kvm_s390_pv_cpu_is_protected(vcpu)) {
4036 vcpu->arch.sie_block->gbea = 1;
4037 vcpu->arch.sie_block->pp = 0;
4038 vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
4039 vcpu->arch.sie_block->todpr = 0;
4040 }
4041 }
4042
kvm_arch_vcpu_ioctl_clear_reset(struct kvm_vcpu * vcpu)4043 static void kvm_arch_vcpu_ioctl_clear_reset(struct kvm_vcpu *vcpu)
4044 {
4045 struct kvm_sync_regs *regs = &vcpu->run->s.regs;
4046
4047 /* Clear reset is a superset of the initial reset */
4048 kvm_arch_vcpu_ioctl_initial_reset(vcpu);
4049
4050 memset(®s->gprs, 0, sizeof(regs->gprs));
4051 memset(®s->vrs, 0, sizeof(regs->vrs));
4052 memset(®s->acrs, 0, sizeof(regs->acrs));
4053 memset(®s->gscb, 0, sizeof(regs->gscb));
4054
4055 regs->etoken = 0;
4056 regs->etoken_extension = 0;
4057 }
4058
kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu * vcpu,struct kvm_regs * regs)4059 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
4060 {
4061 vcpu_load(vcpu);
4062 memcpy(&vcpu->run->s.regs.gprs, ®s->gprs, sizeof(regs->gprs));
4063 vcpu_put(vcpu);
4064 return 0;
4065 }
4066
kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu * vcpu,struct kvm_regs * regs)4067 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
4068 {
4069 vcpu_load(vcpu);
4070 memcpy(®s->gprs, &vcpu->run->s.regs.gprs, sizeof(regs->gprs));
4071 vcpu_put(vcpu);
4072 return 0;
4073 }
4074
kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu * vcpu,struct kvm_sregs * sregs)4075 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
4076 struct kvm_sregs *sregs)
4077 {
4078 vcpu_load(vcpu);
4079
4080 memcpy(&vcpu->run->s.regs.acrs, &sregs->acrs, sizeof(sregs->acrs));
4081 memcpy(&vcpu->arch.sie_block->gcr, &sregs->crs, sizeof(sregs->crs));
4082
4083 vcpu_put(vcpu);
4084 return 0;
4085 }
4086
kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu * vcpu,struct kvm_sregs * sregs)4087 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
4088 struct kvm_sregs *sregs)
4089 {
4090 vcpu_load(vcpu);
4091
4092 memcpy(&sregs->acrs, &vcpu->run->s.regs.acrs, sizeof(sregs->acrs));
4093 memcpy(&sregs->crs, &vcpu->arch.sie_block->gcr, sizeof(sregs->crs));
4094
4095 vcpu_put(vcpu);
4096 return 0;
4097 }
4098
kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu * vcpu,struct kvm_fpu * fpu)4099 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
4100 {
4101 vcpu_load(vcpu);
4102
4103 vcpu->run->s.regs.fpc = fpu->fpc;
4104 if (cpu_has_vx())
4105 convert_fp_to_vx((__vector128 *) vcpu->run->s.regs.vrs,
4106 (freg_t *) fpu->fprs);
4107 else
4108 memcpy(vcpu->run->s.regs.fprs, &fpu->fprs, sizeof(fpu->fprs));
4109
4110 vcpu_put(vcpu);
4111 return 0;
4112 }
4113
kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu * vcpu,struct kvm_fpu * fpu)4114 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
4115 {
4116 vcpu_load(vcpu);
4117
4118 if (cpu_has_vx())
4119 convert_vx_to_fp((freg_t *) fpu->fprs,
4120 (__vector128 *) vcpu->run->s.regs.vrs);
4121 else
4122 memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs));
4123 fpu->fpc = vcpu->run->s.regs.fpc;
4124
4125 vcpu_put(vcpu);
4126 return 0;
4127 }
4128
kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu * vcpu,psw_t psw)4129 static int kvm_arch_vcpu_ioctl_set_initial_psw(struct kvm_vcpu *vcpu, psw_t psw)
4130 {
4131 int rc = 0;
4132
4133 if (!is_vcpu_stopped(vcpu))
4134 rc = -EBUSY;
4135 else {
4136 vcpu->run->psw_mask = psw.mask;
4137 vcpu->run->psw_addr = psw.addr;
4138 }
4139 return rc;
4140 }
4141
kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu * vcpu,struct kvm_translation * tr)4142 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
4143 struct kvm_translation *tr)
4144 {
4145 return -EINVAL; /* not implemented yet */
4146 }
4147
4148 #define VALID_GUESTDBG_FLAGS (KVM_GUESTDBG_SINGLESTEP | \
4149 KVM_GUESTDBG_USE_HW_BP | \
4150 KVM_GUESTDBG_ENABLE)
4151
kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu * vcpu,struct kvm_guest_debug * dbg)4152 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
4153 struct kvm_guest_debug *dbg)
4154 {
4155 int rc = 0;
4156
4157 vcpu_load(vcpu);
4158
4159 vcpu->guest_debug = 0;
4160 kvm_s390_clear_bp_data(vcpu);
4161
4162 if (dbg->control & ~VALID_GUESTDBG_FLAGS) {
4163 rc = -EINVAL;
4164 goto out;
4165 }
4166 if (!sclp.has_gpere) {
4167 rc = -EINVAL;
4168 goto out;
4169 }
4170
4171 if (dbg->control & KVM_GUESTDBG_ENABLE) {
4172 vcpu->guest_debug = dbg->control;
4173 /* enforce guest PER */
4174 kvm_s390_set_cpuflags(vcpu, CPUSTAT_P);
4175
4176 if (dbg->control & KVM_GUESTDBG_USE_HW_BP)
4177 rc = kvm_s390_import_bp_data(vcpu, dbg);
4178 } else {
4179 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P);
4180 vcpu->arch.guestdbg.last_bp = 0;
4181 }
4182
4183 if (rc) {
4184 vcpu->guest_debug = 0;
4185 kvm_s390_clear_bp_data(vcpu);
4186 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_P);
4187 }
4188
4189 out:
4190 vcpu_put(vcpu);
4191 return rc;
4192 }
4193
kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu * vcpu,struct kvm_mp_state * mp_state)4194 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
4195 struct kvm_mp_state *mp_state)
4196 {
4197 int ret;
4198
4199 vcpu_load(vcpu);
4200
4201 /* CHECK_STOP and LOAD are not supported yet */
4202 ret = is_vcpu_stopped(vcpu) ? KVM_MP_STATE_STOPPED :
4203 KVM_MP_STATE_OPERATING;
4204
4205 vcpu_put(vcpu);
4206 return ret;
4207 }
4208
kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu * vcpu,struct kvm_mp_state * mp_state)4209 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
4210 struct kvm_mp_state *mp_state)
4211 {
4212 int rc = 0;
4213
4214 vcpu_load(vcpu);
4215
4216 /* user space knows about this interface - let it control the state */
4217 kvm_s390_set_user_cpu_state_ctrl(vcpu->kvm);
4218
4219 switch (mp_state->mp_state) {
4220 case KVM_MP_STATE_STOPPED:
4221 rc = kvm_s390_vcpu_stop(vcpu);
4222 break;
4223 case KVM_MP_STATE_OPERATING:
4224 rc = kvm_s390_vcpu_start(vcpu);
4225 break;
4226 case KVM_MP_STATE_LOAD:
4227 if (!kvm_s390_pv_cpu_is_protected(vcpu)) {
4228 rc = -ENXIO;
4229 break;
4230 }
4231 rc = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR_LOAD);
4232 break;
4233 case KVM_MP_STATE_CHECK_STOP:
4234 fallthrough; /* CHECK_STOP and LOAD are not supported yet */
4235 default:
4236 rc = -ENXIO;
4237 }
4238
4239 vcpu_put(vcpu);
4240 return rc;
4241 }
4242
ibs_enabled(struct kvm_vcpu * vcpu)4243 static bool ibs_enabled(struct kvm_vcpu *vcpu)
4244 {
4245 return kvm_s390_test_cpuflags(vcpu, CPUSTAT_IBS);
4246 }
4247
vcpu_ucontrol_translate(struct kvm_vcpu * vcpu,gpa_t * gaddr)4248 static int vcpu_ucontrol_translate(struct kvm_vcpu *vcpu, gpa_t *gaddr)
4249 {
4250 int rc;
4251
4252 if (kvm_is_ucontrol(vcpu->kvm)) {
4253 rc = gmap_ucas_translate(vcpu->arch.mc, vcpu->arch.gmap, gaddr);
4254 if (rc == -EREMOTE) {
4255 vcpu->run->exit_reason = KVM_EXIT_S390_UCONTROL;
4256 vcpu->run->s390_ucontrol.trans_exc_code = *gaddr;
4257 vcpu->run->s390_ucontrol.pgm_code = PGM_SEGMENT_TRANSLATION;
4258 }
4259 return rc;
4260 }
4261 return 0;
4262 }
4263
kvm_s390_fixup_prefix(struct kvm_vcpu * vcpu)4264 static int kvm_s390_fixup_prefix(struct kvm_vcpu *vcpu)
4265 {
4266 gpa_t gaddr = kvm_s390_get_prefix(vcpu);
4267 gfn_t gfn;
4268 int rc;
4269
4270 if (vcpu_ucontrol_translate(vcpu, &gaddr))
4271 return -EREMOTE;
4272 gfn = gpa_to_gfn(gaddr);
4273
4274 rc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gfn, true);
4275 if (rc)
4276 return rc;
4277 rc = kvm_s390_faultin_gfn_simple(vcpu, NULL, gfn + 1, true);
4278 if (rc)
4279 return rc;
4280
4281 scoped_guard(write_lock, &vcpu->kvm->mmu_lock)
4282 rc = dat_set_prefix_notif_bit(vcpu->kvm->arch.gmap->asce, gfn);
4283 return rc;
4284 }
4285
kvm_s390_handle_requests(struct kvm_vcpu * vcpu)4286 static int kvm_s390_handle_requests(struct kvm_vcpu *vcpu)
4287 {
4288 retry:
4289 kvm_s390_vcpu_request_handled(vcpu);
4290 if (!kvm_request_pending(vcpu))
4291 return 0;
4292 /*
4293 * If the guest prefix changed, re-arm the ipte notifier for the
4294 * guest prefix page. gmap_mprotect_notify will wait on the ptl lock.
4295 * This ensures that the ipte instruction for this request has
4296 * already finished. We might race against a second unmapper that
4297 * wants to set the blocking bit. Lets just retry the request loop.
4298 */
4299 if (kvm_check_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu)) {
4300 int rc;
4301
4302 rc = kvm_s390_fixup_prefix(vcpu);
4303 if (rc) {
4304 kvm_make_request(KVM_REQ_REFRESH_GUEST_PREFIX, vcpu);
4305 return rc;
4306 }
4307 goto retry;
4308 }
4309
4310 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu)) {
4311 vcpu->arch.sie_block->ihcpu = 0xffff;
4312 goto retry;
4313 }
4314
4315 if (kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu)) {
4316 if (!ibs_enabled(vcpu)) {
4317 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 1);
4318 kvm_s390_set_cpuflags(vcpu, CPUSTAT_IBS);
4319 }
4320 goto retry;
4321 }
4322
4323 if (kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu)) {
4324 if (ibs_enabled(vcpu)) {
4325 trace_kvm_s390_enable_disable_ibs(vcpu->vcpu_id, 0);
4326 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_IBS);
4327 }
4328 goto retry;
4329 }
4330
4331 if (kvm_check_request(KVM_REQ_ICPT_OPEREXC, vcpu)) {
4332 vcpu->arch.sie_block->ictl |= ICTL_OPEREXC;
4333 goto retry;
4334 }
4335
4336 if (kvm_check_request(KVM_REQ_START_MIGRATION, vcpu)) {
4337 /*
4338 * Disable CMM virtualization; we will emulate the ESSA
4339 * instruction manually, in order to provide additional
4340 * functionalities needed for live migration.
4341 */
4342 vcpu->arch.sie_block->ecb2 &= ~ECB2_CMMA;
4343 goto retry;
4344 }
4345
4346 if (kvm_check_request(KVM_REQ_STOP_MIGRATION, vcpu)) {
4347 /*
4348 * Re-enable CMM virtualization if CMMA is available and
4349 * CMM has been used.
4350 */
4351 if (vcpu->kvm->arch.use_cmma && uses_cmm(vcpu->arch.gmap))
4352 vcpu->arch.sie_block->ecb2 |= ECB2_CMMA;
4353 goto retry;
4354 }
4355
4356 /* we left the vsie handler, nothing to do, just clear the request */
4357 kvm_clear_request(KVM_REQ_VSIE_RESTART, vcpu);
4358
4359 return 0;
4360 }
4361
__kvm_s390_set_tod_clock(struct kvm * kvm,const struct kvm_s390_vm_tod_clock * gtod)4362 static void __kvm_s390_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod)
4363 {
4364 struct kvm_vcpu *vcpu;
4365 union tod_clock clk;
4366 unsigned long i;
4367
4368 preempt_disable();
4369
4370 store_tod_clock_ext(&clk);
4371
4372 kvm->arch.epoch = gtod->tod - clk.tod;
4373 kvm->arch.epdx = 0;
4374 if (test_kvm_facility(kvm, 139)) {
4375 kvm->arch.epdx = gtod->epoch_idx - clk.ei;
4376 if (kvm->arch.epoch > gtod->tod)
4377 kvm->arch.epdx -= 1;
4378 }
4379
4380 kvm_s390_vcpu_block_all(kvm);
4381 kvm_for_each_vcpu(i, vcpu, kvm) {
4382 vcpu->arch.sie_block->epoch = kvm->arch.epoch;
4383 vcpu->arch.sie_block->epdx = kvm->arch.epdx;
4384 }
4385
4386 kvm_s390_vcpu_unblock_all(kvm);
4387 preempt_enable();
4388 }
4389
kvm_s390_try_set_tod_clock(struct kvm * kvm,const struct kvm_s390_vm_tod_clock * gtod)4390 int kvm_s390_try_set_tod_clock(struct kvm *kvm, const struct kvm_s390_vm_tod_clock *gtod)
4391 {
4392 if (!mutex_trylock(&kvm->lock))
4393 return 0;
4394 __kvm_s390_set_tod_clock(kvm, gtod);
4395 mutex_unlock(&kvm->lock);
4396 return 1;
4397 }
4398
__kvm_inject_pfault_token(struct kvm_vcpu * vcpu,bool start_token,unsigned long token)4399 static void __kvm_inject_pfault_token(struct kvm_vcpu *vcpu, bool start_token,
4400 unsigned long token)
4401 {
4402 struct kvm_s390_interrupt inti;
4403 struct kvm_s390_irq irq;
4404
4405 if (start_token) {
4406 irq.u.ext.ext_params2 = token;
4407 irq.type = KVM_S390_INT_PFAULT_INIT;
4408 WARN_ON_ONCE(kvm_s390_inject_vcpu(vcpu, &irq));
4409 } else {
4410 inti.type = KVM_S390_INT_PFAULT_DONE;
4411 inti.parm64 = token;
4412 WARN_ON_ONCE(kvm_s390_inject_vm(vcpu->kvm, &inti));
4413 }
4414 }
4415
kvm_arch_async_page_not_present(struct kvm_vcpu * vcpu,struct kvm_async_pf * work)4416 bool kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
4417 struct kvm_async_pf *work)
4418 {
4419 trace_kvm_s390_pfault_init(vcpu, work->arch.pfault_token);
4420 __kvm_inject_pfault_token(vcpu, true, work->arch.pfault_token);
4421
4422 return true;
4423 }
4424
kvm_arch_async_page_present(struct kvm_vcpu * vcpu,struct kvm_async_pf * work)4425 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
4426 struct kvm_async_pf *work)
4427 {
4428 trace_kvm_s390_pfault_done(vcpu, work->arch.pfault_token);
4429 __kvm_inject_pfault_token(vcpu, false, work->arch.pfault_token);
4430 }
4431
kvm_arch_async_page_ready(struct kvm_vcpu * vcpu,struct kvm_async_pf * work)4432 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu,
4433 struct kvm_async_pf *work)
4434 {
4435 /* s390 will always inject the page directly */
4436 }
4437
kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu * vcpu)4438 bool kvm_arch_can_dequeue_async_page_present(struct kvm_vcpu *vcpu)
4439 {
4440 /*
4441 * s390 will always inject the page directly,
4442 * but we still want check_async_completion to cleanup
4443 */
4444 return true;
4445 }
4446
kvm_arch_setup_async_pf(struct kvm_vcpu * vcpu)4447 bool kvm_arch_setup_async_pf(struct kvm_vcpu *vcpu)
4448 {
4449 hva_t hva;
4450 struct kvm_arch_async_pf arch;
4451
4452 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
4453 return false;
4454 if ((vcpu->arch.sie_block->gpsw.mask & vcpu->arch.pfault_select) !=
4455 vcpu->arch.pfault_compare)
4456 return false;
4457 if (psw_extint_disabled(vcpu))
4458 return false;
4459 if (kvm_s390_vcpu_has_irq(vcpu, 0))
4460 return false;
4461 if (!(vcpu->arch.sie_block->gcr[0] & CR0_SERVICE_SIGNAL_SUBMASK))
4462 return false;
4463 if (!pfault_enabled(vcpu->arch.gmap))
4464 return false;
4465
4466 hva = gfn_to_hva(vcpu->kvm, current->thread.gmap_teid.addr);
4467 if (read_guest_real(vcpu, vcpu->arch.pfault_token, &arch.pfault_token, 8))
4468 return false;
4469
4470 return kvm_setup_async_pf(vcpu, current->thread.gmap_teid.addr * PAGE_SIZE, hva, &arch);
4471 }
4472
vcpu_pre_run(struct kvm_vcpu * vcpu)4473 static int vcpu_pre_run(struct kvm_vcpu *vcpu)
4474 {
4475 int rc, cpuflags;
4476
4477 /*
4478 * On s390 notifications for arriving pages will be delivered directly
4479 * to the guest but the house keeping for completed pfaults is
4480 * handled outside the worker.
4481 */
4482 kvm_check_async_pf_completion(vcpu);
4483
4484 vcpu->arch.sie_block->gg14 = vcpu->run->s.regs.gprs[14];
4485 vcpu->arch.sie_block->gg15 = vcpu->run->s.regs.gprs[15];
4486
4487 if (!kvm_is_ucontrol(vcpu->kvm)) {
4488 rc = kvm_s390_deliver_pending_interrupts(vcpu);
4489 if (rc || guestdbg_exit_pending(vcpu))
4490 return rc;
4491 }
4492
4493 rc = kvm_s390_handle_requests(vcpu);
4494 if (rc)
4495 return rc;
4496
4497 if (guestdbg_enabled(vcpu)) {
4498 kvm_s390_backup_guest_per_regs(vcpu);
4499 kvm_s390_patch_guest_per_regs(vcpu);
4500 }
4501
4502 clear_bit(vcpu->vcpu_idx, vcpu->kvm->arch.gisa_int.kicked_mask);
4503
4504 vcpu->arch.sie_block->icptcode = 0;
4505 current->thread.gmap_int_code = 0;
4506 cpuflags = atomic_read(&vcpu->arch.sie_block->cpuflags);
4507 VCPU_EVENT(vcpu, 6, "entering sie flags %x", cpuflags);
4508 trace_kvm_s390_sie_enter(vcpu, cpuflags);
4509
4510 return 0;
4511 }
4512
vcpu_post_run_addressing_exception(struct kvm_vcpu * vcpu)4513 static int vcpu_post_run_addressing_exception(struct kvm_vcpu *vcpu)
4514 {
4515 struct kvm_s390_pgm_info pgm_info = {
4516 .code = PGM_ADDRESSING,
4517 };
4518 u8 opcode, ilen;
4519 int rc;
4520
4521 VCPU_EVENT(vcpu, 3, "%s", "fault in sie instruction");
4522 trace_kvm_s390_sie_fault(vcpu);
4523
4524 /*
4525 * We want to inject an addressing exception, which is defined as a
4526 * suppressing or terminating exception. However, since we came here
4527 * by a DAT access exception, the PSW still points to the faulting
4528 * instruction since DAT exceptions are nullifying. So we've got
4529 * to look up the current opcode to get the length of the instruction
4530 * to be able to forward the PSW.
4531 */
4532 rc = read_guest_instr(vcpu, vcpu->arch.sie_block->gpsw.addr, &opcode, 1);
4533 ilen = insn_length(opcode);
4534 if (rc < 0) {
4535 return rc;
4536 } else if (rc) {
4537 /* Instruction-Fetching Exceptions - we can't detect the ilen.
4538 * Forward by arbitrary ilc, injection will take care of
4539 * nullification if necessary.
4540 */
4541 pgm_info = vcpu->arch.pgm;
4542 ilen = 4;
4543 }
4544 pgm_info.flags = ilen | KVM_S390_PGM_FLAGS_ILC_VALID;
4545 kvm_s390_forward_psw(vcpu, ilen);
4546 return kvm_s390_inject_prog_irq(vcpu, &pgm_info);
4547 }
4548
kvm_s390_assert_primary_as(struct kvm_vcpu * vcpu)4549 static void kvm_s390_assert_primary_as(struct kvm_vcpu *vcpu)
4550 {
4551 KVM_BUG(current->thread.gmap_teid.as != PSW_BITS_AS_PRIMARY, vcpu->kvm,
4552 "Unexpected program interrupt 0x%x, TEID 0x%016lx",
4553 current->thread.gmap_int_code, current->thread.gmap_teid.val);
4554 }
4555
vcpu_dat_fault_handler(struct kvm_vcpu * vcpu,gpa_t gaddr,bool wr)4556 static int vcpu_dat_fault_handler(struct kvm_vcpu *vcpu, gpa_t gaddr, bool wr)
4557 {
4558 struct guest_fault f = {
4559 .write_attempt = wr,
4560 .attempt_pfault = pfault_enabled(vcpu->arch.gmap),
4561 };
4562 int rc;
4563
4564 if (vcpu_ucontrol_translate(vcpu, &gaddr))
4565 return -EREMOTE;
4566 f.gfn = gpa_to_gfn(gaddr);
4567
4568 rc = kvm_s390_faultin_gfn(vcpu, NULL, &f);
4569 if (rc <= 0)
4570 return rc;
4571 if (rc == PGM_ADDRESSING)
4572 return vcpu_post_run_addressing_exception(vcpu);
4573 KVM_BUG_ON(rc, vcpu->kvm);
4574 return -EINVAL;
4575 }
4576
vcpu_post_run_handle_fault(struct kvm_vcpu * vcpu)4577 static int vcpu_post_run_handle_fault(struct kvm_vcpu *vcpu)
4578 {
4579 unsigned int foll = 0;
4580 unsigned long gaddr;
4581 int rc;
4582
4583 gaddr = current->thread.gmap_teid.addr * PAGE_SIZE;
4584 if (kvm_s390_cur_gmap_fault_is_write())
4585 foll = FOLL_WRITE;
4586
4587 switch (current->thread.gmap_int_code & PGM_INT_CODE_MASK) {
4588 case 0:
4589 vcpu->stat.exit_null++;
4590 break;
4591 case PGM_SECURE_STORAGE_ACCESS:
4592 case PGM_SECURE_STORAGE_VIOLATION:
4593 kvm_s390_assert_primary_as(vcpu);
4594 /*
4595 * This can happen after a reboot with asynchronous teardown;
4596 * the new guest (normal or protected) will run on top of the
4597 * previous protected guest. The old pages need to be destroyed
4598 * so the new guest can use them.
4599 */
4600 if (kvm_s390_pv_destroy_page(vcpu->kvm, gaddr)) {
4601 /*
4602 * Either KVM messed up the secure guest mapping or the
4603 * same page is mapped into multiple secure guests.
4604 *
4605 * This exception is only triggered when a guest 2 is
4606 * running and can therefore never occur in kernel
4607 * context.
4608 */
4609 pr_warn_ratelimited("Secure storage violation (%x) in task: %s, pid %d\n",
4610 current->thread.gmap_int_code, current->comm,
4611 current->pid);
4612 send_sig(SIGSEGV, current, 0);
4613 }
4614 break;
4615 case PGM_NON_SECURE_STORAGE_ACCESS:
4616 kvm_s390_assert_primary_as(vcpu);
4617 /*
4618 * This is normal operation; a page belonging to a protected
4619 * guest has not been imported yet. Try to import the page into
4620 * the protected guest.
4621 */
4622 rc = kvm_s390_pv_convert_to_secure(vcpu->kvm, gaddr);
4623 if (rc == -EINVAL)
4624 send_sig(SIGSEGV, current, 0);
4625 if (rc != -ENXIO)
4626 break;
4627 foll = FOLL_WRITE;
4628 fallthrough;
4629 case PGM_PROTECTION:
4630 case PGM_SEGMENT_TRANSLATION:
4631 case PGM_PAGE_TRANSLATION:
4632 case PGM_ASCE_TYPE:
4633 case PGM_REGION_FIRST_TRANS:
4634 case PGM_REGION_SECOND_TRANS:
4635 case PGM_REGION_THIRD_TRANS:
4636 kvm_s390_assert_primary_as(vcpu);
4637 return vcpu_dat_fault_handler(vcpu, gaddr, foll);
4638 default:
4639 KVM_BUG(1, vcpu->kvm, "Unexpected program interrupt 0x%x, TEID 0x%016lx",
4640 current->thread.gmap_int_code, current->thread.gmap_teid.val);
4641 send_sig(SIGSEGV, current, 0);
4642 break;
4643 }
4644 return 0;
4645 }
4646
vcpu_post_run(struct kvm_vcpu * vcpu,int sie_return)4647 static int vcpu_post_run(struct kvm_vcpu *vcpu, int sie_return)
4648 {
4649 struct mcck_volatile_info *mcck_info;
4650 struct sie_page *sie_page;
4651 int rc;
4652
4653 VCPU_EVENT(vcpu, 6, "exit sie icptcode %d",
4654 vcpu->arch.sie_block->icptcode);
4655 trace_kvm_s390_sie_exit(vcpu, vcpu->arch.sie_block->icptcode);
4656
4657 if (guestdbg_enabled(vcpu))
4658 kvm_s390_restore_guest_per_regs(vcpu);
4659
4660 vcpu->run->s.regs.gprs[14] = vcpu->arch.sie_block->gg14;
4661 vcpu->run->s.regs.gprs[15] = vcpu->arch.sie_block->gg15;
4662
4663 if (sie_return == SIE64_RETURN_MCCK) {
4664 sie_page = container_of(vcpu->arch.sie_block,
4665 struct sie_page, sie_block);
4666 mcck_info = &sie_page->mcck_info;
4667 kvm_s390_reinject_machine_check(vcpu, mcck_info);
4668 return 0;
4669 }
4670 WARN_ON_ONCE(sie_return != SIE64_RETURN_NORMAL);
4671
4672 if (vcpu->arch.sie_block->icptcode > 0) {
4673 rc = kvm_handle_sie_intercept(vcpu);
4674
4675 if (rc != -EOPNOTSUPP)
4676 return rc;
4677 vcpu->run->exit_reason = KVM_EXIT_S390_SIEIC;
4678 vcpu->run->s390_sieic.icptcode = vcpu->arch.sie_block->icptcode;
4679 vcpu->run->s390_sieic.ipa = vcpu->arch.sie_block->ipa;
4680 vcpu->run->s390_sieic.ipb = vcpu->arch.sie_block->ipb;
4681 return -EREMOTE;
4682 }
4683
4684 return vcpu_post_run_handle_fault(vcpu);
4685 }
4686
kvm_s390_enter_exit_sie(struct kvm_s390_sie_block * scb,u64 * gprs,unsigned long gasce)4687 int noinstr kvm_s390_enter_exit_sie(struct kvm_s390_sie_block *scb,
4688 u64 *gprs, unsigned long gasce)
4689 {
4690 int ret;
4691
4692 guest_state_enter_irqoff();
4693
4694 /*
4695 * The guest_state_{enter,exit}_irqoff() functions inform lockdep and
4696 * tracing that entry to the guest will enable host IRQs, and exit from
4697 * the guest will disable host IRQs.
4698 */
4699 ret = sie64a(scb, gprs, gasce);
4700
4701 guest_state_exit_irqoff();
4702
4703 return ret;
4704 }
4705
4706 #define PSW_INT_MASK (PSW_MASK_EXT | PSW_MASK_IO | PSW_MASK_MCHECK)
__vcpu_run(struct kvm_vcpu * vcpu)4707 static int __vcpu_run(struct kvm_vcpu *vcpu)
4708 {
4709 int rc, sie_return;
4710 struct sie_page *sie_page = (struct sie_page *)vcpu->arch.sie_block;
4711
4712 /*
4713 * We try to hold kvm->srcu during most of vcpu_run (except when run-
4714 * ning the guest), so that memslots (and other stuff) are protected
4715 */
4716 kvm_vcpu_srcu_read_lock(vcpu);
4717
4718 while (true) {
4719 rc = vcpu_pre_run(vcpu);
4720 kvm_vcpu_srcu_read_unlock(vcpu);
4721 if (rc || guestdbg_exit_pending(vcpu))
4722 break;
4723
4724 /*
4725 * As PF_VCPU will be used in fault handler, between
4726 * guest_timing_enter_irqoff and guest_timing_exit_irqoff
4727 * should be no uaccess.
4728 */
4729 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
4730 memcpy(sie_page->pv_grregs,
4731 vcpu->run->s.regs.gprs,
4732 sizeof(sie_page->pv_grregs));
4733 }
4734
4735 xfer_to_guest_mode_check:
4736 local_irq_disable();
4737 xfer_to_guest_mode_prepare();
4738 if (xfer_to_guest_mode_work_pending()) {
4739 local_irq_enable();
4740 rc = kvm_xfer_to_guest_mode_handle_work(vcpu);
4741 if (rc)
4742 break;
4743 goto xfer_to_guest_mode_check;
4744 }
4745
4746 guest_timing_enter_irqoff();
4747 __disable_cpu_timer_accounting(vcpu);
4748
4749 sie_return = kvm_s390_enter_exit_sie(vcpu->arch.sie_block,
4750 vcpu->run->s.regs.gprs,
4751 vcpu->arch.gmap->asce.val);
4752
4753 __enable_cpu_timer_accounting(vcpu);
4754 guest_timing_exit_irqoff();
4755 local_irq_enable();
4756
4757 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
4758 memcpy(vcpu->run->s.regs.gprs,
4759 sie_page->pv_grregs,
4760 sizeof(sie_page->pv_grregs));
4761 /*
4762 * We're not allowed to inject interrupts on intercepts
4763 * that leave the guest state in an "in-between" state
4764 * where the next SIE entry will do a continuation.
4765 * Fence interrupts in our "internal" PSW.
4766 */
4767 if (vcpu->arch.sie_block->icptcode == ICPT_PV_INSTR ||
4768 vcpu->arch.sie_block->icptcode == ICPT_PV_PREF) {
4769 vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK;
4770 }
4771 }
4772 kvm_vcpu_srcu_read_lock(vcpu);
4773
4774 rc = vcpu_post_run(vcpu, sie_return);
4775 if (rc || guestdbg_exit_pending(vcpu)) {
4776 kvm_vcpu_srcu_read_unlock(vcpu);
4777 break;
4778 }
4779 }
4780
4781 return rc;
4782 }
4783
sync_regs_fmt2(struct kvm_vcpu * vcpu)4784 static void sync_regs_fmt2(struct kvm_vcpu *vcpu)
4785 {
4786 struct kvm_run *kvm_run = vcpu->run;
4787 struct runtime_instr_cb *riccb;
4788 struct gs_cb *gscb;
4789
4790 riccb = (struct runtime_instr_cb *) &kvm_run->s.regs.riccb;
4791 gscb = (struct gs_cb *) &kvm_run->s.regs.gscb;
4792 vcpu->arch.sie_block->gpsw.mask = kvm_run->psw_mask;
4793 vcpu->arch.sie_block->gpsw.addr = kvm_run->psw_addr;
4794 if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
4795 vcpu->arch.sie_block->todpr = kvm_run->s.regs.todpr;
4796 vcpu->arch.sie_block->pp = kvm_run->s.regs.pp;
4797 vcpu->arch.sie_block->gbea = kvm_run->s.regs.gbea;
4798 }
4799 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PFAULT) {
4800 vcpu->arch.pfault_token = kvm_run->s.regs.pft;
4801 vcpu->arch.pfault_select = kvm_run->s.regs.pfs;
4802 vcpu->arch.pfault_compare = kvm_run->s.regs.pfc;
4803 if (vcpu->arch.pfault_token == KVM_S390_PFAULT_TOKEN_INVALID)
4804 kvm_clear_async_pf_completion_queue(vcpu);
4805 }
4806 if (kvm_run->kvm_dirty_regs & KVM_SYNC_DIAG318) {
4807 vcpu->arch.diag318_info.val = kvm_run->s.regs.diag318;
4808 vcpu->arch.sie_block->cpnc = vcpu->arch.diag318_info.cpnc;
4809 VCPU_EVENT(vcpu, 3, "setting cpnc to %d", vcpu->arch.diag318_info.cpnc);
4810 }
4811 /*
4812 * If userspace sets the riccb (e.g. after migration) to a valid state,
4813 * we should enable RI here instead of doing the lazy enablement.
4814 */
4815 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_RICCB) &&
4816 test_kvm_facility(vcpu->kvm, 64) &&
4817 riccb->v &&
4818 !(vcpu->arch.sie_block->ecb3 & ECB3_RI)) {
4819 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: RI (sync_regs)");
4820 vcpu->arch.sie_block->ecb3 |= ECB3_RI;
4821 }
4822 /*
4823 * If userspace sets the gscb (e.g. after migration) to non-zero,
4824 * we should enable GS here instead of doing the lazy enablement.
4825 */
4826 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_GSCB) &&
4827 test_kvm_facility(vcpu->kvm, 133) &&
4828 gscb->gssm &&
4829 !vcpu->arch.gs_enabled) {
4830 VCPU_EVENT(vcpu, 3, "%s", "ENABLE: GS (sync_regs)");
4831 vcpu->arch.sie_block->ecb |= ECB_GS;
4832 vcpu->arch.sie_block->ecd |= ECD_HOSTREGMGMT;
4833 vcpu->arch.gs_enabled = 1;
4834 }
4835 if ((kvm_run->kvm_dirty_regs & KVM_SYNC_BPBC) &&
4836 test_kvm_facility(vcpu->kvm, 82)) {
4837 vcpu->arch.sie_block->fpf &= ~FPF_BPBC;
4838 vcpu->arch.sie_block->fpf |= kvm_run->s.regs.bpbc ? FPF_BPBC : 0;
4839 }
4840 if (cpu_has_gs()) {
4841 preempt_disable();
4842 local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT);
4843 if (current->thread.gs_cb) {
4844 vcpu->arch.host_gscb = current->thread.gs_cb;
4845 save_gs_cb(vcpu->arch.host_gscb);
4846 }
4847 if (vcpu->arch.gs_enabled) {
4848 current->thread.gs_cb = (struct gs_cb *)
4849 &vcpu->run->s.regs.gscb;
4850 restore_gs_cb(current->thread.gs_cb);
4851 }
4852 preempt_enable();
4853 }
4854 /* SIE will load etoken directly from SDNX and therefore kvm_run */
4855 }
4856
sync_regs(struct kvm_vcpu * vcpu)4857 static void sync_regs(struct kvm_vcpu *vcpu)
4858 {
4859 struct kvm_run *kvm_run = vcpu->run;
4860
4861 if (kvm_run->kvm_dirty_regs & KVM_SYNC_PREFIX)
4862 kvm_s390_set_prefix(vcpu, kvm_run->s.regs.prefix);
4863 if (kvm_run->kvm_dirty_regs & KVM_SYNC_CRS) {
4864 memcpy(&vcpu->arch.sie_block->gcr, &kvm_run->s.regs.crs, 128);
4865 /* some control register changes require a tlb flush */
4866 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
4867 }
4868 if (kvm_run->kvm_dirty_regs & KVM_SYNC_ARCH0) {
4869 kvm_s390_set_cpu_timer(vcpu, kvm_run->s.regs.cputm);
4870 vcpu->arch.sie_block->ckc = kvm_run->s.regs.ckc;
4871 }
4872 save_access_regs(vcpu->arch.host_acrs);
4873 restore_access_regs(vcpu->run->s.regs.acrs);
4874 vcpu->arch.acrs_loaded = true;
4875 kvm_s390_fpu_load(vcpu->run);
4876 /* Sync fmt2 only data */
4877 if (likely(!kvm_s390_pv_cpu_is_protected(vcpu))) {
4878 sync_regs_fmt2(vcpu);
4879 } else {
4880 /*
4881 * In several places we have to modify our internal view to
4882 * not do things that are disallowed by the ultravisor. For
4883 * example we must not inject interrupts after specific exits
4884 * (e.g. 112 prefix page not secure). We do this by turning
4885 * off the machine check, external and I/O interrupt bits
4886 * of our PSW copy. To avoid getting validity intercepts, we
4887 * do only accept the condition code from userspace.
4888 */
4889 vcpu->arch.sie_block->gpsw.mask &= ~PSW_MASK_CC;
4890 vcpu->arch.sie_block->gpsw.mask |= kvm_run->psw_mask &
4891 PSW_MASK_CC;
4892 }
4893
4894 kvm_run->kvm_dirty_regs = 0;
4895 }
4896
store_regs_fmt2(struct kvm_vcpu * vcpu)4897 static void store_regs_fmt2(struct kvm_vcpu *vcpu)
4898 {
4899 struct kvm_run *kvm_run = vcpu->run;
4900
4901 kvm_run->s.regs.todpr = vcpu->arch.sie_block->todpr;
4902 kvm_run->s.regs.pp = vcpu->arch.sie_block->pp;
4903 kvm_run->s.regs.gbea = vcpu->arch.sie_block->gbea;
4904 kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC;
4905 kvm_run->s.regs.diag318 = vcpu->arch.diag318_info.val;
4906 if (cpu_has_gs()) {
4907 preempt_disable();
4908 local_ctl_set_bit(2, CR2_GUARDED_STORAGE_BIT);
4909 if (vcpu->arch.gs_enabled)
4910 save_gs_cb(current->thread.gs_cb);
4911 current->thread.gs_cb = vcpu->arch.host_gscb;
4912 restore_gs_cb(vcpu->arch.host_gscb);
4913 if (!vcpu->arch.host_gscb)
4914 local_ctl_clear_bit(2, CR2_GUARDED_STORAGE_BIT);
4915 vcpu->arch.host_gscb = NULL;
4916 preempt_enable();
4917 }
4918 /* SIE will save etoken directly into SDNX and therefore kvm_run */
4919 }
4920
store_regs(struct kvm_vcpu * vcpu)4921 static void store_regs(struct kvm_vcpu *vcpu)
4922 {
4923 struct kvm_run *kvm_run = vcpu->run;
4924
4925 kvm_run->psw_mask = vcpu->arch.sie_block->gpsw.mask;
4926 kvm_run->psw_addr = vcpu->arch.sie_block->gpsw.addr;
4927 kvm_run->s.regs.prefix = kvm_s390_get_prefix(vcpu);
4928 memcpy(&kvm_run->s.regs.crs, &vcpu->arch.sie_block->gcr, 128);
4929 kvm_run->s.regs.cputm = kvm_s390_get_cpu_timer(vcpu);
4930 kvm_run->s.regs.ckc = vcpu->arch.sie_block->ckc;
4931 kvm_run->s.regs.pft = vcpu->arch.pfault_token;
4932 kvm_run->s.regs.pfs = vcpu->arch.pfault_select;
4933 kvm_run->s.regs.pfc = vcpu->arch.pfault_compare;
4934 save_access_regs(vcpu->run->s.regs.acrs);
4935 restore_access_regs(vcpu->arch.host_acrs);
4936 vcpu->arch.acrs_loaded = false;
4937 kvm_s390_fpu_store(vcpu->run);
4938 if (likely(!kvm_s390_pv_cpu_is_protected(vcpu)))
4939 store_regs_fmt2(vcpu);
4940 }
4941
kvm_arch_vcpu_ioctl_run(struct kvm_vcpu * vcpu)4942 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
4943 {
4944 struct kvm_run *kvm_run = vcpu->run;
4945 DECLARE_KERNEL_FPU_ONSTACK32(fpu);
4946 int rc;
4947
4948 /*
4949 * Running a VM while dumping always has the potential to
4950 * produce inconsistent dump data. But for PV vcpus a SIE
4951 * entry while dumping could also lead to a fatal validity
4952 * intercept which we absolutely want to avoid.
4953 */
4954 if (vcpu->kvm->arch.pv.dumping)
4955 return -EINVAL;
4956
4957 if (!vcpu->wants_to_run)
4958 return -EINTR;
4959
4960 if (kvm_run->kvm_valid_regs & ~KVM_SYNC_S390_VALID_FIELDS ||
4961 kvm_run->kvm_dirty_regs & ~KVM_SYNC_S390_VALID_FIELDS)
4962 return -EINVAL;
4963
4964 vcpu_load(vcpu);
4965
4966 if (guestdbg_exit_pending(vcpu)) {
4967 kvm_s390_prepare_debug_exit(vcpu);
4968 rc = 0;
4969 goto out;
4970 }
4971
4972 kvm_sigset_activate(vcpu);
4973
4974 /*
4975 * no need to check the return value of vcpu_start as it can only have
4976 * an error for protvirt, but protvirt means user cpu state
4977 */
4978 if (!kvm_s390_user_cpu_state_ctrl(vcpu->kvm)) {
4979 kvm_s390_vcpu_start(vcpu);
4980 } else if (is_vcpu_stopped(vcpu)) {
4981 pr_err_ratelimited("can't run stopped vcpu %d\n",
4982 vcpu->vcpu_id);
4983 rc = -EINVAL;
4984 goto out;
4985 }
4986
4987 kernel_fpu_begin(&fpu, KERNEL_FPC | KERNEL_VXR);
4988 sync_regs(vcpu);
4989 enable_cpu_timer_accounting(vcpu);
4990
4991 might_fault();
4992 rc = __vcpu_run(vcpu);
4993
4994 if (signal_pending(current) && !rc) {
4995 kvm_run->exit_reason = KVM_EXIT_INTR;
4996 vcpu->stat.signal_exits++;
4997 rc = -EINTR;
4998 }
4999
5000 if (guestdbg_exit_pending(vcpu) && !rc) {
5001 kvm_s390_prepare_debug_exit(vcpu);
5002 rc = 0;
5003 }
5004
5005 if (rc == -EREMOTE) {
5006 /* userspace support is needed, kvm_run has been prepared */
5007 rc = 0;
5008 }
5009
5010 disable_cpu_timer_accounting(vcpu);
5011 store_regs(vcpu);
5012 kernel_fpu_end(&fpu, KERNEL_FPC | KERNEL_VXR);
5013
5014 kvm_sigset_deactivate(vcpu);
5015
5016 vcpu->stat.exit_userspace++;
5017 out:
5018 vcpu_put(vcpu);
5019 return rc;
5020 }
5021
5022 /*
5023 * store status at address
5024 * we use have two special cases:
5025 * KVM_S390_STORE_STATUS_NOADDR: -> 0x1200 on 64 bit
5026 * KVM_S390_STORE_STATUS_PREFIXED: -> prefix
5027 */
kvm_s390_store_status_unloaded(struct kvm_vcpu * vcpu,unsigned long gpa)5028 int kvm_s390_store_status_unloaded(struct kvm_vcpu *vcpu, unsigned long gpa)
5029 {
5030 unsigned char archmode = 1;
5031 freg_t fprs[NUM_FPRS];
5032 unsigned int px;
5033 u64 clkcomp, cputm;
5034 int rc;
5035
5036 px = kvm_s390_get_prefix(vcpu);
5037 if (gpa == KVM_S390_STORE_STATUS_NOADDR) {
5038 if (write_guest_abs(vcpu, 163, &archmode, 1))
5039 return -EFAULT;
5040 gpa = 0;
5041 } else if (gpa == KVM_S390_STORE_STATUS_PREFIXED) {
5042 if (write_guest_real(vcpu, 163, &archmode, 1))
5043 return -EFAULT;
5044 gpa = px;
5045 } else
5046 gpa -= __LC_FPREGS_SAVE_AREA;
5047
5048 /* manually convert vector registers if necessary */
5049 if (cpu_has_vx()) {
5050 convert_vx_to_fp(fprs, (__vector128 *) vcpu->run->s.regs.vrs);
5051 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
5052 fprs, 128);
5053 } else {
5054 rc = write_guest_abs(vcpu, gpa + __LC_FPREGS_SAVE_AREA,
5055 vcpu->run->s.regs.fprs, 128);
5056 }
5057 rc |= write_guest_abs(vcpu, gpa + __LC_GPREGS_SAVE_AREA,
5058 vcpu->run->s.regs.gprs, 128);
5059 rc |= write_guest_abs(vcpu, gpa + __LC_PSW_SAVE_AREA,
5060 &vcpu->arch.sie_block->gpsw, 16);
5061 rc |= write_guest_abs(vcpu, gpa + __LC_PREFIX_SAVE_AREA,
5062 &px, 4);
5063 rc |= write_guest_abs(vcpu, gpa + __LC_FP_CREG_SAVE_AREA,
5064 &vcpu->run->s.regs.fpc, 4);
5065 rc |= write_guest_abs(vcpu, gpa + __LC_TOD_PROGREG_SAVE_AREA,
5066 &vcpu->arch.sie_block->todpr, 4);
5067 cputm = kvm_s390_get_cpu_timer(vcpu);
5068 rc |= write_guest_abs(vcpu, gpa + __LC_CPU_TIMER_SAVE_AREA,
5069 &cputm, 8);
5070 clkcomp = vcpu->arch.sie_block->ckc >> 8;
5071 rc |= write_guest_abs(vcpu, gpa + __LC_CLOCK_COMP_SAVE_AREA,
5072 &clkcomp, 8);
5073 rc |= write_guest_abs(vcpu, gpa + __LC_AREGS_SAVE_AREA,
5074 &vcpu->run->s.regs.acrs, 64);
5075 rc |= write_guest_abs(vcpu, gpa + __LC_CREGS_SAVE_AREA,
5076 &vcpu->arch.sie_block->gcr, 128);
5077 return rc ? -EFAULT : 0;
5078 }
5079
kvm_s390_vcpu_store_status(struct kvm_vcpu * vcpu,unsigned long addr)5080 int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
5081 {
5082 /*
5083 * The guest FPRS and ACRS are in the host FPRS/ACRS due to the lazy
5084 * switch in the run ioctl. Let's update our copies before we save
5085 * it into the save area
5086 */
5087 kvm_s390_fpu_store(vcpu->run);
5088 save_access_regs(vcpu->run->s.regs.acrs);
5089
5090 return kvm_s390_store_status_unloaded(vcpu, addr);
5091 }
5092
__disable_ibs_on_vcpu(struct kvm_vcpu * vcpu)5093 static void __disable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
5094 {
5095 kvm_check_request(KVM_REQ_ENABLE_IBS, vcpu);
5096 kvm_s390_sync_request(KVM_REQ_DISABLE_IBS, vcpu);
5097 }
5098
__disable_ibs_on_all_vcpus(struct kvm * kvm)5099 static void __disable_ibs_on_all_vcpus(struct kvm *kvm)
5100 {
5101 unsigned long i;
5102 struct kvm_vcpu *vcpu;
5103
5104 kvm_for_each_vcpu(i, vcpu, kvm) {
5105 __disable_ibs_on_vcpu(vcpu);
5106 }
5107 }
5108
__enable_ibs_on_vcpu(struct kvm_vcpu * vcpu)5109 static void __enable_ibs_on_vcpu(struct kvm_vcpu *vcpu)
5110 {
5111 if (!sclp.has_ibs)
5112 return;
5113 kvm_check_request(KVM_REQ_DISABLE_IBS, vcpu);
5114 kvm_s390_sync_request(KVM_REQ_ENABLE_IBS, vcpu);
5115 }
5116
kvm_s390_vcpu_start(struct kvm_vcpu * vcpu)5117 int kvm_s390_vcpu_start(struct kvm_vcpu *vcpu)
5118 {
5119 int i, online_vcpus, r = 0, started_vcpus = 0;
5120
5121 if (!is_vcpu_stopped(vcpu))
5122 return 0;
5123
5124 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 1);
5125 /* Only one cpu at a time may enter/leave the STOPPED state. */
5126 spin_lock(&vcpu->kvm->arch.start_stop_lock);
5127 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
5128
5129 /* Let's tell the UV that we want to change into the operating state */
5130 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
5131 r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_OPR);
5132 if (r) {
5133 spin_unlock(&vcpu->kvm->arch.start_stop_lock);
5134 return r;
5135 }
5136 }
5137
5138 for (i = 0; i < online_vcpus; i++) {
5139 if (!is_vcpu_stopped(kvm_get_vcpu(vcpu->kvm, i)))
5140 started_vcpus++;
5141 }
5142
5143 if (started_vcpus == 0) {
5144 /* we're the only active VCPU -> speed it up */
5145 __enable_ibs_on_vcpu(vcpu);
5146 } else if (started_vcpus == 1) {
5147 /*
5148 * As we are starting a second VCPU, we have to disable
5149 * the IBS facility on all VCPUs to remove potentially
5150 * outstanding ENABLE requests.
5151 */
5152 __disable_ibs_on_all_vcpus(vcpu->kvm);
5153 }
5154
5155 kvm_s390_clear_cpuflags(vcpu, CPUSTAT_STOPPED);
5156 /*
5157 * The real PSW might have changed due to a RESTART interpreted by the
5158 * ultravisor. We block all interrupts and let the next sie exit
5159 * refresh our view.
5160 */
5161 if (kvm_s390_pv_cpu_is_protected(vcpu))
5162 vcpu->arch.sie_block->gpsw.mask &= ~PSW_INT_MASK;
5163 /*
5164 * Another VCPU might have used IBS while we were offline.
5165 * Let's play safe and flush the VCPU at startup.
5166 */
5167 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
5168 spin_unlock(&vcpu->kvm->arch.start_stop_lock);
5169 return 0;
5170 }
5171
kvm_s390_vcpu_stop(struct kvm_vcpu * vcpu)5172 int kvm_s390_vcpu_stop(struct kvm_vcpu *vcpu)
5173 {
5174 int i, online_vcpus, r = 0, started_vcpus = 0;
5175 struct kvm_vcpu *started_vcpu = NULL;
5176
5177 if (is_vcpu_stopped(vcpu))
5178 return 0;
5179
5180 trace_kvm_s390_vcpu_start_stop(vcpu->vcpu_id, 0);
5181 /* Only one cpu at a time may enter/leave the STOPPED state. */
5182 spin_lock(&vcpu->kvm->arch.start_stop_lock);
5183 online_vcpus = atomic_read(&vcpu->kvm->online_vcpus);
5184
5185 /* Let's tell the UV that we want to change into the stopped state */
5186 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
5187 r = kvm_s390_pv_set_cpu_state(vcpu, PV_CPU_STATE_STP);
5188 if (r) {
5189 spin_unlock(&vcpu->kvm->arch.start_stop_lock);
5190 return r;
5191 }
5192 }
5193
5194 /*
5195 * Set the VCPU to STOPPED and THEN clear the interrupt flag,
5196 * now that the SIGP STOP and SIGP STOP AND STORE STATUS orders
5197 * have been fully processed. This will ensure that the VCPU
5198 * is kept BUSY if another VCPU is inquiring with SIGP SENSE.
5199 */
5200 kvm_s390_set_cpuflags(vcpu, CPUSTAT_STOPPED);
5201 kvm_s390_clear_stop_irq(vcpu);
5202
5203 __disable_ibs_on_vcpu(vcpu);
5204
5205 for (i = 0; i < online_vcpus; i++) {
5206 struct kvm_vcpu *tmp = kvm_get_vcpu(vcpu->kvm, i);
5207
5208 if (!is_vcpu_stopped(tmp)) {
5209 started_vcpus++;
5210 started_vcpu = tmp;
5211 }
5212 }
5213
5214 if (started_vcpus == 1) {
5215 /*
5216 * As we only have one VCPU left, we want to enable the
5217 * IBS facility for that VCPU to speed it up.
5218 */
5219 __enable_ibs_on_vcpu(started_vcpu);
5220 }
5221
5222 spin_unlock(&vcpu->kvm->arch.start_stop_lock);
5223 return 0;
5224 }
5225
kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu * vcpu,struct kvm_enable_cap * cap)5226 static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
5227 struct kvm_enable_cap *cap)
5228 {
5229 int r;
5230
5231 if (cap->flags)
5232 return -EINVAL;
5233
5234 switch (cap->cap) {
5235 case KVM_CAP_S390_CSS_SUPPORT:
5236 if (!vcpu->kvm->arch.css_support) {
5237 vcpu->kvm->arch.css_support = 1;
5238 VM_EVENT(vcpu->kvm, 3, "%s", "ENABLE: CSS support");
5239 trace_kvm_s390_enable_css(vcpu->kvm);
5240 }
5241 r = 0;
5242 break;
5243 default:
5244 r = -EINVAL;
5245 break;
5246 }
5247 return r;
5248 }
5249
kvm_s390_vcpu_sida_op(struct kvm_vcpu * vcpu,struct kvm_s390_mem_op * mop)5250 static long kvm_s390_vcpu_sida_op(struct kvm_vcpu *vcpu,
5251 struct kvm_s390_mem_op *mop)
5252 {
5253 void __user *uaddr = (void __user *)mop->buf;
5254 void *sida_addr;
5255 int r = 0;
5256
5257 if (mop->flags || !mop->size)
5258 return -EINVAL;
5259 if (mop->size + mop->sida_offset < mop->size)
5260 return -EINVAL;
5261 if (mop->size + mop->sida_offset > sida_size(vcpu->arch.sie_block))
5262 return -E2BIG;
5263 if (!kvm_s390_pv_cpu_is_protected(vcpu))
5264 return -EINVAL;
5265
5266 sida_addr = (char *)sida_addr(vcpu->arch.sie_block) + mop->sida_offset;
5267
5268 switch (mop->op) {
5269 case KVM_S390_MEMOP_SIDA_READ:
5270 if (copy_to_user(uaddr, sida_addr, mop->size))
5271 r = -EFAULT;
5272
5273 break;
5274 case KVM_S390_MEMOP_SIDA_WRITE:
5275 if (copy_from_user(sida_addr, uaddr, mop->size))
5276 r = -EFAULT;
5277 break;
5278 }
5279 return r;
5280 }
5281
kvm_s390_vcpu_mem_op(struct kvm_vcpu * vcpu,struct kvm_s390_mem_op * mop)5282 static long kvm_s390_vcpu_mem_op(struct kvm_vcpu *vcpu,
5283 struct kvm_s390_mem_op *mop)
5284 {
5285 void __user *uaddr = (void __user *)mop->buf;
5286 void *tmpbuf __free(kvfree) = NULL;
5287 enum gacc_mode acc_mode;
5288 int r;
5289
5290 r = mem_op_validate_common(mop, KVM_S390_MEMOP_F_INJECT_EXCEPTION |
5291 KVM_S390_MEMOP_F_CHECK_ONLY |
5292 KVM_S390_MEMOP_F_SKEY_PROTECTION);
5293 if (r)
5294 return r;
5295 if (mop->ar >= NUM_ACRS)
5296 return -EINVAL;
5297 if (kvm_s390_pv_cpu_is_protected(vcpu))
5298 return -EINVAL;
5299 if (!(mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY)) {
5300 tmpbuf = vmalloc(mop->size);
5301 if (!tmpbuf)
5302 return -ENOMEM;
5303 }
5304
5305 acc_mode = mop->op == KVM_S390_MEMOP_LOGICAL_READ ? GACC_FETCH : GACC_STORE;
5306 if (mop->flags & KVM_S390_MEMOP_F_CHECK_ONLY) {
5307 r = check_gva_range(vcpu, mop->gaddr, mop->ar, mop->size,
5308 acc_mode, mop->key);
5309 } else if (acc_mode == GACC_FETCH) {
5310 r = read_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf,
5311 mop->size, mop->key);
5312 if (!r && copy_to_user(uaddr, tmpbuf, mop->size))
5313 return -EFAULT;
5314 } else {
5315 if (copy_from_user(tmpbuf, uaddr, mop->size))
5316 return -EFAULT;
5317 r = write_guest_with_key(vcpu, mop->gaddr, mop->ar, tmpbuf,
5318 mop->size, mop->key);
5319 }
5320
5321 if (r > 0 && (mop->flags & KVM_S390_MEMOP_F_INJECT_EXCEPTION) != 0)
5322 kvm_s390_inject_prog_irq(vcpu, &vcpu->arch.pgm);
5323
5324 return r;
5325 }
5326
kvm_s390_vcpu_memsida_op(struct kvm_vcpu * vcpu,struct kvm_s390_mem_op * mop)5327 static long kvm_s390_vcpu_memsida_op(struct kvm_vcpu *vcpu,
5328 struct kvm_s390_mem_op *mop)
5329 {
5330 int r, srcu_idx;
5331
5332 srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
5333
5334 switch (mop->op) {
5335 case KVM_S390_MEMOP_LOGICAL_READ:
5336 case KVM_S390_MEMOP_LOGICAL_WRITE:
5337 r = kvm_s390_vcpu_mem_op(vcpu, mop);
5338 break;
5339 case KVM_S390_MEMOP_SIDA_READ:
5340 case KVM_S390_MEMOP_SIDA_WRITE:
5341 /* we are locked against sida going away by the vcpu->mutex */
5342 r = kvm_s390_vcpu_sida_op(vcpu, mop);
5343 break;
5344 default:
5345 r = -EINVAL;
5346 }
5347
5348 srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
5349 return r;
5350 }
5351
kvm_arch_vcpu_unlocked_ioctl(struct file * filp,unsigned int ioctl,unsigned long arg)5352 long kvm_arch_vcpu_unlocked_ioctl(struct file *filp, unsigned int ioctl,
5353 unsigned long arg)
5354 {
5355 struct kvm_vcpu *vcpu = filp->private_data;
5356 void __user *argp = (void __user *)arg;
5357 int rc;
5358
5359 switch (ioctl) {
5360 case KVM_S390_IRQ: {
5361 struct kvm_s390_irq s390irq;
5362
5363 if (copy_from_user(&s390irq, argp, sizeof(s390irq)))
5364 return -EFAULT;
5365 rc = kvm_s390_inject_vcpu(vcpu, &s390irq);
5366 break;
5367 }
5368 case KVM_S390_INTERRUPT: {
5369 struct kvm_s390_interrupt s390int;
5370 struct kvm_s390_irq s390irq = {};
5371
5372 if (copy_from_user(&s390int, argp, sizeof(s390int)))
5373 return -EFAULT;
5374 if (s390int_to_s390irq(&s390int, &s390irq))
5375 return -EINVAL;
5376 rc = kvm_s390_inject_vcpu(vcpu, &s390irq);
5377 break;
5378 }
5379 default:
5380 rc = -ENOIOCTLCMD;
5381 break;
5382 }
5383
5384 /*
5385 * To simplify single stepping of userspace-emulated instructions,
5386 * KVM_EXIT_S390_SIEIC exit sets KVM_GUESTDBG_EXIT_PENDING (see
5387 * should_handle_per_ifetch()). However, if userspace emulation injects
5388 * an interrupt, it needs to be cleared, so that KVM_EXIT_DEBUG happens
5389 * after (and not before) the interrupt delivery.
5390 */
5391 if (!rc)
5392 vcpu->guest_debug &= ~KVM_GUESTDBG_EXIT_PENDING;
5393
5394 return rc;
5395 }
5396
kvm_s390_handle_pv_vcpu_dump(struct kvm_vcpu * vcpu,struct kvm_pv_cmd * cmd)5397 static int kvm_s390_handle_pv_vcpu_dump(struct kvm_vcpu *vcpu,
5398 struct kvm_pv_cmd *cmd)
5399 {
5400 struct kvm_s390_pv_dmp dmp;
5401 void *data;
5402 int ret;
5403
5404 /* Dump initialization is a prerequisite */
5405 if (!vcpu->kvm->arch.pv.dumping)
5406 return -EINVAL;
5407
5408 if (copy_from_user(&dmp, (__u8 __user *)cmd->data, sizeof(dmp)))
5409 return -EFAULT;
5410
5411 /* We only handle this subcmd right now */
5412 if (dmp.subcmd != KVM_PV_DUMP_CPU)
5413 return -EINVAL;
5414
5415 /* CPU dump length is the same as create cpu storage donation. */
5416 if (dmp.buff_len != uv_info.guest_cpu_stor_len)
5417 return -EINVAL;
5418
5419 data = kvzalloc(uv_info.guest_cpu_stor_len, GFP_KERNEL);
5420 if (!data)
5421 return -ENOMEM;
5422
5423 ret = kvm_s390_pv_dump_cpu(vcpu, data, &cmd->rc, &cmd->rrc);
5424
5425 VCPU_EVENT(vcpu, 3, "PROTVIRT DUMP CPU %d rc %x rrc %x",
5426 vcpu->vcpu_id, cmd->rc, cmd->rrc);
5427
5428 if (ret)
5429 ret = -EINVAL;
5430
5431 /* On success copy over the dump data */
5432 if (!ret && copy_to_user((__u8 __user *)dmp.buff_addr, data, uv_info.guest_cpu_stor_len))
5433 ret = -EFAULT;
5434
5435 kvfree(data);
5436 return ret;
5437 }
5438
kvm_arch_vcpu_ioctl(struct file * filp,unsigned int ioctl,unsigned long arg)5439 long kvm_arch_vcpu_ioctl(struct file *filp,
5440 unsigned int ioctl, unsigned long arg)
5441 {
5442 struct kvm_vcpu *vcpu = filp->private_data;
5443 void __user *argp = (void __user *)arg;
5444 int idx;
5445 long r;
5446 u16 rc, rrc;
5447
5448 vcpu_load(vcpu);
5449
5450 switch (ioctl) {
5451 case KVM_S390_STORE_STATUS:
5452 idx = srcu_read_lock(&vcpu->kvm->srcu);
5453 r = kvm_s390_store_status_unloaded(vcpu, arg);
5454 srcu_read_unlock(&vcpu->kvm->srcu, idx);
5455 break;
5456 case KVM_S390_SET_INITIAL_PSW: {
5457 psw_t psw;
5458
5459 r = -EFAULT;
5460 if (copy_from_user(&psw, argp, sizeof(psw)))
5461 break;
5462 r = kvm_arch_vcpu_ioctl_set_initial_psw(vcpu, psw);
5463 break;
5464 }
5465 case KVM_S390_CLEAR_RESET:
5466 r = 0;
5467 kvm_arch_vcpu_ioctl_clear_reset(vcpu);
5468 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
5469 r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu),
5470 UVC_CMD_CPU_RESET_CLEAR, &rc, &rrc);
5471 VCPU_EVENT(vcpu, 3, "PROTVIRT RESET CLEAR VCPU: rc %x rrc %x",
5472 rc, rrc);
5473 }
5474 break;
5475 case KVM_S390_INITIAL_RESET:
5476 r = 0;
5477 kvm_arch_vcpu_ioctl_initial_reset(vcpu);
5478 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
5479 r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu),
5480 UVC_CMD_CPU_RESET_INITIAL,
5481 &rc, &rrc);
5482 VCPU_EVENT(vcpu, 3, "PROTVIRT RESET INITIAL VCPU: rc %x rrc %x",
5483 rc, rrc);
5484 }
5485 break;
5486 case KVM_S390_NORMAL_RESET:
5487 r = 0;
5488 kvm_arch_vcpu_ioctl_normal_reset(vcpu);
5489 if (kvm_s390_pv_cpu_is_protected(vcpu)) {
5490 r = uv_cmd_nodata(kvm_s390_pv_cpu_get_handle(vcpu),
5491 UVC_CMD_CPU_RESET, &rc, &rrc);
5492 VCPU_EVENT(vcpu, 3, "PROTVIRT RESET NORMAL VCPU: rc %x rrc %x",
5493 rc, rrc);
5494 }
5495 break;
5496 case KVM_SET_ONE_REG:
5497 case KVM_GET_ONE_REG: {
5498 struct kvm_one_reg reg;
5499 r = -EINVAL;
5500 if (kvm_s390_pv_cpu_is_protected(vcpu))
5501 break;
5502 r = -EFAULT;
5503 if (copy_from_user(®, argp, sizeof(reg)))
5504 break;
5505 if (ioctl == KVM_SET_ONE_REG)
5506 r = kvm_arch_vcpu_ioctl_set_one_reg(vcpu, ®);
5507 else
5508 r = kvm_arch_vcpu_ioctl_get_one_reg(vcpu, ®);
5509 break;
5510 }
5511 #ifdef CONFIG_KVM_S390_UCONTROL
5512 case KVM_S390_UCAS_MAP: {
5513 struct kvm_s390_ucas_mapping ucas;
5514
5515 r = -EFAULT;
5516 if (copy_from_user(&ucas, argp, sizeof(ucas)))
5517 break;
5518
5519 r = -EINVAL;
5520 if (!kvm_is_ucontrol(vcpu->kvm))
5521 break;
5522 if (!IS_ALIGNED(ucas.user_addr | ucas.vcpu_addr | ucas.length, _SEGMENT_SIZE))
5523 break;
5524
5525 r = gmap_ucas_map(vcpu->arch.gmap, gpa_to_gfn(ucas.user_addr),
5526 gpa_to_gfn(ucas.vcpu_addr),
5527 ucas.length >> _SEGMENT_SHIFT);
5528 break;
5529 }
5530 case KVM_S390_UCAS_UNMAP: {
5531 struct kvm_s390_ucas_mapping ucas;
5532
5533 r = -EFAULT;
5534 if (copy_from_user(&ucas, argp, sizeof(ucas)))
5535 break;
5536
5537 r = -EINVAL;
5538 if (!kvm_is_ucontrol(vcpu->kvm))
5539 break;
5540 if (!IS_ALIGNED(ucas.vcpu_addr | ucas.length, _SEGMENT_SIZE))
5541 break;
5542
5543 gmap_ucas_unmap(vcpu->arch.gmap, gpa_to_gfn(ucas.vcpu_addr),
5544 ucas.length >> _SEGMENT_SHIFT);
5545 r = 0;
5546 break;
5547 }
5548 #endif
5549 case KVM_S390_VCPU_FAULT: {
5550 gpa_t gaddr = arg;
5551
5552 scoped_guard(srcu, &vcpu->kvm->srcu) {
5553 r = vcpu_ucontrol_translate(vcpu, &gaddr);
5554 if (r)
5555 break;
5556
5557 r = kvm_s390_faultin_gfn_simple(vcpu, NULL, gpa_to_gfn(gaddr), false);
5558 if (r == PGM_ADDRESSING)
5559 r = -EFAULT;
5560 if (r <= 0)
5561 break;
5562 r = -EIO;
5563 KVM_BUG_ON(r, vcpu->kvm);
5564 }
5565 break;
5566 }
5567 case KVM_ENABLE_CAP:
5568 {
5569 struct kvm_enable_cap cap;
5570 r = -EFAULT;
5571 if (copy_from_user(&cap, argp, sizeof(cap)))
5572 break;
5573 r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
5574 break;
5575 }
5576 case KVM_S390_MEM_OP: {
5577 struct kvm_s390_mem_op mem_op;
5578
5579 if (copy_from_user(&mem_op, argp, sizeof(mem_op)) == 0)
5580 r = kvm_s390_vcpu_memsida_op(vcpu, &mem_op);
5581 else
5582 r = -EFAULT;
5583 break;
5584 }
5585 case KVM_S390_SET_IRQ_STATE: {
5586 struct kvm_s390_irq_state irq_state;
5587
5588 r = -EFAULT;
5589 if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
5590 break;
5591 if (irq_state.len > VCPU_IRQS_MAX_BUF ||
5592 irq_state.len == 0 ||
5593 irq_state.len % sizeof(struct kvm_s390_irq) > 0) {
5594 r = -EINVAL;
5595 break;
5596 }
5597 /* do not use irq_state.flags, it will break old QEMUs */
5598 r = kvm_s390_set_irq_state(vcpu,
5599 (void __user *) irq_state.buf,
5600 irq_state.len);
5601 break;
5602 }
5603 case KVM_S390_GET_IRQ_STATE: {
5604 struct kvm_s390_irq_state irq_state;
5605
5606 r = -EFAULT;
5607 if (copy_from_user(&irq_state, argp, sizeof(irq_state)))
5608 break;
5609 if (irq_state.len == 0) {
5610 r = -EINVAL;
5611 break;
5612 }
5613 /* do not use irq_state.flags, it will break old QEMUs */
5614 r = kvm_s390_get_irq_state(vcpu,
5615 (__u8 __user *) irq_state.buf,
5616 irq_state.len);
5617 break;
5618 }
5619 case KVM_S390_PV_CPU_COMMAND: {
5620 struct kvm_pv_cmd cmd;
5621
5622 r = -EINVAL;
5623 if (!is_prot_virt_host())
5624 break;
5625
5626 r = -EFAULT;
5627 if (copy_from_user(&cmd, argp, sizeof(cmd)))
5628 break;
5629
5630 r = -EINVAL;
5631 if (cmd.flags)
5632 break;
5633
5634 /* We only handle this cmd right now */
5635 if (cmd.cmd != KVM_PV_DUMP)
5636 break;
5637
5638 r = kvm_s390_handle_pv_vcpu_dump(vcpu, &cmd);
5639
5640 /* Always copy over UV rc / rrc data */
5641 if (copy_to_user((__u8 __user *)argp, &cmd.rc,
5642 sizeof(cmd.rc) + sizeof(cmd.rrc)))
5643 r = -EFAULT;
5644 break;
5645 }
5646 default:
5647 r = -ENOTTY;
5648 }
5649
5650 vcpu_put(vcpu);
5651 return r;
5652 }
5653
kvm_arch_vcpu_fault(struct kvm_vcpu * vcpu,struct vm_fault * vmf)5654 vm_fault_t kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
5655 {
5656 #ifdef CONFIG_KVM_S390_UCONTROL
5657 if ((vmf->pgoff == KVM_S390_SIE_PAGE_OFFSET)
5658 && (kvm_is_ucontrol(vcpu->kvm))) {
5659 vmf->page = virt_to_page(vcpu->arch.sie_block);
5660 get_page(vmf->page);
5661 return 0;
5662 }
5663 #endif
5664 return VM_FAULT_SIGBUS;
5665 }
5666
kvm_arch_irqchip_in_kernel(struct kvm * kvm)5667 bool kvm_arch_irqchip_in_kernel(struct kvm *kvm)
5668 {
5669 return true;
5670 }
5671
5672 /* Section: memory related */
kvm_arch_prepare_memory_region(struct kvm * kvm,const struct kvm_memory_slot * old,struct kvm_memory_slot * new,enum kvm_mr_change change)5673 int kvm_arch_prepare_memory_region(struct kvm *kvm,
5674 const struct kvm_memory_slot *old,
5675 struct kvm_memory_slot *new,
5676 enum kvm_mr_change change)
5677 {
5678 if (kvm_is_ucontrol(kvm) && new && new->id < KVM_USER_MEM_SLOTS)
5679 return -EINVAL;
5680
5681 /* When we are protected, we should not change the memory slots */
5682 if (kvm_s390_pv_get_handle(kvm))
5683 return -EINVAL;
5684
5685 if (change != KVM_MR_DELETE && change != KVM_MR_FLAGS_ONLY) {
5686 /*
5687 * A few sanity checks. The memory in userland is ok to be
5688 * fragmented into various different vmas. It is okay to mmap()
5689 * and munmap() stuff in this slot after doing this call at any
5690 * time.
5691 */
5692 if (new->userspace_addr & ~PAGE_MASK)
5693 return -EINVAL;
5694 if ((new->base_gfn + new->npages) * PAGE_SIZE > kvm->arch.mem_limit)
5695 return -EINVAL;
5696 if (!asce_contains_gfn(kvm->arch.gmap->asce, new->base_gfn + new->npages - 1))
5697 return -EINVAL;
5698 }
5699
5700 if (!kvm->arch.migration_mode)
5701 return 0;
5702
5703 /*
5704 * Turn off migration mode when:
5705 * - userspace creates a new memslot with dirty logging off,
5706 * - userspace modifies an existing memslot (MOVE or FLAGS_ONLY) and
5707 * dirty logging is turned off.
5708 * Migration mode expects dirty page logging being enabled to store
5709 * its dirty bitmap.
5710 */
5711 if (change != KVM_MR_DELETE &&
5712 !(new->flags & KVM_MEM_LOG_DIRTY_PAGES))
5713 WARN(kvm_s390_vm_stop_migration(kvm),
5714 "Failed to stop migration mode");
5715
5716 return 0;
5717 }
5718
kvm_arch_commit_memory_region(struct kvm * kvm,struct kvm_memory_slot * old,const struct kvm_memory_slot * new,enum kvm_mr_change change)5719 void kvm_arch_commit_memory_region(struct kvm *kvm,
5720 struct kvm_memory_slot *old,
5721 const struct kvm_memory_slot *new,
5722 enum kvm_mr_change change)
5723 {
5724 struct kvm_s390_mmu_cache *mc = NULL;
5725 int rc = 0;
5726
5727 if (change == KVM_MR_FLAGS_ONLY)
5728 return;
5729
5730 mc = kvm_s390_new_mmu_cache();
5731 if (!mc) {
5732 rc = -ENOMEM;
5733 goto out;
5734 }
5735
5736 scoped_guard(write_lock, &kvm->mmu_lock) {
5737 switch (change) {
5738 case KVM_MR_DELETE:
5739 rc = dat_delete_slot(mc, kvm->arch.gmap->asce, old->base_gfn, old->npages);
5740 break;
5741 case KVM_MR_MOVE:
5742 rc = dat_delete_slot(mc, kvm->arch.gmap->asce, old->base_gfn, old->npages);
5743 if (rc)
5744 break;
5745 fallthrough;
5746 case KVM_MR_CREATE:
5747 rc = dat_create_slot(mc, kvm->arch.gmap->asce, new->base_gfn, new->npages);
5748 break;
5749 case KVM_MR_FLAGS_ONLY:
5750 break;
5751 default:
5752 WARN(1, "Unknown KVM MR CHANGE: %d\n", change);
5753 }
5754 }
5755 out:
5756 if (rc)
5757 pr_warn("failed to commit memory region\n");
5758 kvm_s390_free_mmu_cache(mc);
5759 return;
5760 }
5761
5762 /**
5763 * kvm_test_age_gfn() - test young
5764 * @kvm: the kvm instance
5765 * @range: the range of guest addresses whose young status needs to be cleared
5766 *
5767 * Context: called by KVM common code without holding the kvm mmu lock
5768 * Return: true if any page in the given range is young, otherwise 0.
5769 */
kvm_test_age_gfn(struct kvm * kvm,struct kvm_gfn_range * range)5770 bool kvm_test_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
5771 {
5772 scoped_guard(read_lock, &kvm->mmu_lock)
5773 return dat_test_age_gfn(kvm->arch.gmap->asce, range->start, range->end);
5774 }
5775
5776 /**
5777 * kvm_age_gfn() - clear young
5778 * @kvm: the kvm instance
5779 * @range: the range of guest addresses whose young status needs to be cleared
5780 *
5781 * Context: called by KVM common code without holding the kvm mmu lock
5782 * Return: true if any page in the given range was young, otherwise 0.
5783 */
kvm_age_gfn(struct kvm * kvm,struct kvm_gfn_range * range)5784 bool kvm_age_gfn(struct kvm *kvm, struct kvm_gfn_range *range)
5785 {
5786 scoped_guard(read_lock, &kvm->mmu_lock)
5787 return gmap_age_gfn(kvm->arch.gmap, range->start, range->end);
5788 }
5789
5790 /**
5791 * kvm_unmap_gfn_range() - Unmap a range of guest addresses
5792 * @kvm: the kvm instance
5793 * @range: the range of guest page frames to invalidate
5794 *
5795 * This function always returns false because every DAT table modification
5796 * has to use the appropriate DAT table manipulation instructions, which will
5797 * keep the TLB coherent, hence no additional TLB flush is ever required.
5798 *
5799 * Context: called by KVM common code with the kvm mmu write lock held
5800 * Return: false
5801 */
kvm_unmap_gfn_range(struct kvm * kvm,struct kvm_gfn_range * range)5802 bool kvm_unmap_gfn_range(struct kvm *kvm, struct kvm_gfn_range *range)
5803 {
5804 return gmap_unmap_gfn_range(kvm->arch.gmap, range->slot, range->start, range->end);
5805 }
5806
nonhyp_mask(int i)5807 static inline unsigned long nonhyp_mask(int i)
5808 {
5809 unsigned int nonhyp_fai = (sclp.hmfai << i * 2) >> 30;
5810
5811 return 0x0000ffffffffffffUL >> (nonhyp_fai << 4);
5812 }
5813
kvm_s390_init(void)5814 static int __init kvm_s390_init(void)
5815 {
5816 int i, r;
5817
5818 if (!sclp.has_sief2) {
5819 pr_info("SIE is not available\n");
5820 return -ENODEV;
5821 }
5822
5823 for (i = 0; i < 16; i++)
5824 kvm_s390_fac_base[i] |=
5825 stfle_fac_list[i] & nonhyp_mask(i);
5826
5827 r = __kvm_s390_init();
5828 if (r)
5829 return r;
5830
5831 r = kvm_init(sizeof(struct kvm_vcpu), 0, THIS_MODULE);
5832 if (r) {
5833 __kvm_s390_exit();
5834 return r;
5835 }
5836 return 0;
5837 }
5838
kvm_s390_exit(void)5839 static void __exit kvm_s390_exit(void)
5840 {
5841 kvm_exit();
5842
5843 __kvm_s390_exit();
5844 }
5845
5846 module_init(kvm_s390_init);
5847 module_exit(kvm_s390_exit);
5848
5849 /*
5850 * Enable autoloading of the kvm module.
5851 * Note that we add the module alias here instead of virt/kvm/kvm_main.c
5852 * since x86 takes a different approach.
5853 */
5854 #include <linux/miscdevice.h>
5855 MODULE_ALIAS_MISCDEV(KVM_MINOR);
5856 MODULE_ALIAS("devname:kvm");
5857